fix build for qt5 and the Intel compiler (#14387)

* Set conflicts for qt5 and the Intel compiler

This PR sets a `conflicts` statement for QT5 and the Intel compiler.

* New patches for intel compiles

This commit adds two patches to get QT5 to compile with the intel
compilers. The two patches are very similar but the file being patched
was changed substantially between qt-5.11 and qt-5.12. The patch checks
versions of both GCC and Intel compilers to know when to use overflow
builtis. Essentially, GCC must be >= 5 and Intel must be >= 18.

The sqlite dependency needs the `+column_metadata` variant when the
Intel compiler is used. That is made conditional on the compiler but it
might make sense to make that the default for the sqlite dependency.

Some other changes were made based on testing builds of various QT5
versions with several Intel compilers.

- The libxext dependency is still needed for QT5
- A dependency on libxrender is needed
- The gtk option format needs to be constrained at the qt@5.7 level, not
  qt@5.8.
- An extra configure option is needed for the sql plugins RPATH

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