Fix build for moab 4.9.2 on gcc8 (#12328)

```
5 errors found in build log:
     609      CXX      mbpart.o
     610      CXX      quality.o
     611      CXX      umr.o
     612      CXX      merge.o
     613      CXX      parread.o
     614    mbpart.cpp: In function 'int main(int, char**)':
  >> 615    mbpart.cpp:494:19: error: no match for 'operator<<' (operand types
            are 'std::ostream' {aka 'std::basic_ostream<char>'} and 'std::ostri
            ngstream' {aka 'std::__cxx11::basic_ostringstream<char>'})
     616             std::cerr << tmp_output_file << " : failed to write file."
             << std::endl;
     617             ~~~~~~~~~~^~~~~~~~~~~~~~~~~~
     618    mbpart.cpp:494:19: note: candidate: 'operator<<(int, int)' <built-i
            n>
     619    mbpart.cpp:494:19: note:   no known conversion for argument 2 from
            'std::ostringstream' {aka 'std::__cxx11::basic_ostringstream<char>'
            } to 'int'
     620    In file included from /software/user_tools/centos-7.2.1511/cades-ns
            ed-spack/opt/spack/linux-centos7-x86_64/gcc-4.8.5/gcc-8.2.0-uc6sbum
            ioobdbkw4rwfyn2givi4nyvwq/include/c++/8.2.0/iterator:64,
     621                     from /software/user_tools/centos-7.2.1511/cades-ns
            ed-spack/var/spack/stage/moab-4.9.2-77uuzmj4ofb7z7vz6m25sftyks7p5do
            7/spack-src/src/moab/Range.hpp:167,

     ...

     886    /software/user_tools/centos-7.2.1511/cades-nsed-spack/opt/spack/lin
            ux-centos7-x86_64/gcc-4.8.5/gcc-8.2.0-uc6sbumioobdbkw4rwfyn2givi4ny
            vwq/include/c++/8.2.0/ostream:682:5: note: candidate: 'template<cla
            ss _Ostream, class _Tp> typename std::enable_if<std::__and_<std::__
            not_<std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basi
            c_ostream<_Ostream>, std::__is_insertable<typename std::__is_conver
            tible_to_basic_ostream<_Tp>::__ostream_type, const _Tp&, void> >::v
            alue, typename std::__is_convertible_to_basic_ostream<_Tp>::__ostre
            am_type>::type std::operator<<(_Ostream&&, const _Tp&)'
     887         operator<<(_Ostream&& __os, const _Tp& __x)
     888         ^~~~~~~~
     889    /software/user_tools/centos-7.2.1511/cades-nsed-spack/opt/spack/lin
            ux-centos7-x86_64/gcc-4.8.5/gcc-8.2.0-uc6sbumioobdbkw4rwfyn2givi4ny
            vwq/include/c++/8.2.0/ostream:682:5: note:   template argument dedu
            ction/substitution failed:
     890    /software/user_tools/centos-7.2.1511/cades-nsed-spack/opt/spack/lin
            ux-centos7-x86_64/gcc-4.8.5/gcc-8.2.0-uc6sbumioobdbkw4rwfyn2givi4ny
            vwq/include/c++/8.2.0/ostream: In substitution of 'template<class _
            Ostream, class _Tp> typename std::enable_if<std::__and_<std::__not_
            <std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basic_os
            tream<_Ostream>, std::__is_insertable<typename std::__is_convertibl
            e_to_basic_ostream<_Tp>::__ostream_type, const _Tp&, void> >::value
            , typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_t
            ype>::type std::operator<<(_Ostream&&, const _Tp&) [with _Ostream =
             std::basic_ostream<char>&; _Tp = std::__cxx11::basic_ostringstream
            <char>]':
     891    mbpart.cpp:494:22:   required from here
  >> 892    /software/user_tools/centos-7.2.1511/cades-nsed-spack/opt/spack/lin
            ux-centos7-x86_64/gcc-4.8.5/gcc-8.2.0-uc6sbumioobdbkw4rwfyn2givi4ny
            vwq/include/c++/8.2.0/ostream:682:5: error: no type named 'type' in
             'struct std::enable_if<false, std::basic_ostream<char>&>'
     893      CXXLD    mbdepth
     894      CXXLD    hexmodops
  >> 895    make[2]: *** [mbpart.o] Error 1
     896    make[2]: *** Waiting for unfinished jobs....
     897    make[2]: Leaving directory `/localscratch/tmp/s3j-spack/spack-stage
            /spack-stage-NT13kT/spack-src/tools'
  >> 898    make[1]: *** [all-recursive] Error 1
     899    make[1]: Leaving directory `/localscratch/tmp/s3j-spack/spack-stage
            /spack-stage-NT13kT/spack-src/tools'
  >> 900    make: *** [all-recursive] Error 1
```

2 files changed, 13 insertions, 0 deletions

diff --git a/var/spack/repos/builtin/packages/moab/package.py b/var/spack/repos/builtin/packages/moab/package.py
index 86de1b5264..5e116bd91b 100644
--- a/var/spack/repos/builtin/packages/moab/package.py
+++ b/var/spack/repos/builtin/packages/moab/package.py
@@ -85,6 +85,8 @@ class Moab(AutotoolsPackage):
     # FIXME it seems that zoltan needs to be built without fortran
     depends_on('zoltan~fortran', when='+zoltan')
 
+    patch('tools-492.patch', when='@4.9.2')
+
     def configure_args(self):
         spec = self.spec
 
diff --git a/var/spack/repos/builtin/packages/moab/tools-492.patch b/var/spack/repos/builtin/packages/moab/tools-492.patch
new file mode 100644
index 0000000000..2cb0be1955
--- /dev/null
+++ b/var/spack/repos/builtin/packages/moab/tools-492.patch
@@ -0,0 +1,11 @@
+--- a/tools/mbpart.cpp	2019-03-22 10:10:23.242049300 -0400
++++ b/tools/mbpart.cpp	2019-03-22 10:10:26.354738990 -0400
+@@ -491,7 +491,7 @@
+       rval = mb.write_file(tmp_output_file.str().c_str());
+       if (MB_SUCCESS != rval)
+       {
+-        std::cerr << tmp_output_file << " : failed to write file." << std::endl;
++        std::cerr << tmp_output_file.str() << " : failed to write file." << std::endl;
+         std::cerr << "  Error code: " << mb.get_error_string(rval) << " ("
+                   << rval << ")" << std::endl;
+         std::string errstr;