user/gitlab-runner: patch armv7 for multiple redefinition 'seek'.

the file:

    sys/unix/syscall_linux_arm.go

seems to declare 'seek()' as a prototype, the implementation being:

    sys/unix/syscall_linux_gccgo_arm.go

however it isn't immediately clear why the conflict occurs, unless
it has to do with our Makefile patches, which CGO_ENABLED=1?

fixes #956

1 files changed, 38 insertions, 0 deletions

diff --git a/user/gitlab-runner/fix-multiple-redef-seek.patch b/user/gitlab-runner/fix-multiple-redef-seek.patch
new file mode 100644
index 000000000..5a9d1ef10
--- /dev/null
+++ b/user/gitlab-runner/fix-multiple-redef-seek.patch
@@ -0,0 +1,38 @@
+diff -ur a/vendor/golang.org/x/sys/unix/syscall_linux_arm.go b/vendor/golang.org/x/sys/unix/syscall_linux_arm.go
+--- a/vendor/golang.org/x/sys/unix/syscall_linux_arm.go	2023-01-04 02:17:18.689781320 +0000
++++ b/vendor/golang.org/x/sys/unix/syscall_linux_arm.go	2023-01-04 02:19:46.688219811 +0000
+@@ -45,7 +45,13 @@
+ 
+ // Underlying system call writes to newoffset via pointer.
+ // Implemented in assembly to avoid allocation.
+-func seek(fd int, offset int64, whence int) (newoffset int64, err syscall.Errno)
++func seek(fd int, offset int64, whence int) (int64, syscall.Errno) {
++	var newoffset int64
++	offsetLow := uint32(offset & 0xffffffff)
++	offsetHigh := uint32((offset >> 32) & 0xffffffff)
++	_, _, err := Syscall6(SYS__LLSEEK, uintptr(fd), uintptr(offsetHigh), uintptr(offsetLow), uintptr(unsafe.Pointer(&newoffset)), uintptr(whence), 0)
++	return newoffset, err
++}
+ 
+ func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
+ 	newoffset, errno := seek(fd, offset, whence)
+diff -ur a/vendor/golang.org/x/sys/unix/syscall_linux_gccgo_arm.go b/vendor/golang.org/x/sys/unix/syscall_linux_gccgo_arm.go
+--- a/vendor/golang.org/x/sys/unix/syscall_linux_gccgo_arm.go	2023-01-04 02:17:18.689781320 +0000
++++ b/vendor/golang.org/x/sys/unix/syscall_linux_gccgo_arm.go	2023-01-04 02:20:04.283558738 +0000
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style
+ // license that can be found in the LICENSE file.
+ 
+-// +build linux,gccgo,arm
++// +build linux,!gccgo,arm
+ 
+ package unix
+ 
+@@ -11,6 +11,7 @@
+ 	"unsafe"
+ )
+ 
++// this file should not be built
+ func seek(fd int, offset int64, whence int) (int64, syscall.Errno) {
+ 	var newoffset int64
+ 	offsetLow := uint32(offset & 0xffffffff)