Fix libsanitizer for older GCC in newer machines.

When compiling older GCC versions in newer machines, libsanitizer
does not compile, showing a error: `multiple definition of
'enum fsconfig_command'` (e.g.
https://github.com/llvm/llvm-project/issues/56421).
This is because starting from Glibc 2.36, it is not possible to include
both "linux/fs.h" and "sys/mount.h".

We can apply a patch, similar to the one in
https://reviews.llvm.org/D129471 , but with the extension and lines
changed to match the file. This is also similar to the upstream fix.

See merge request nexedi/slapos!1579

component/gcc/buildout.cfg

@@ -67,6 +67,10 @@ extra-configure-options =
 <= gcc-common
 version = 8.5.0
 md5sum = 0c1f625768840187ef3b10adebe8e3b0
+patch-binary = ${patch:location}/bin/patch
+patch-options = -p1
+patches =
+  ${:_profile_base_location_}/gcc-libsanitizer-multiple-definition-fsconfig_command.patch#2135c53c901d67ce230f5c94352b7780
 
 [gcc-10.5]
 <= gcc-common

component/gcc/gcc-libsanitizer-multiple-definition-fsconfig_command.patch

+diff --git a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
+--- a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
++++ b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
+@@ -65,7 +65,6 @@
+ #include <sys/vt.h>
+ #include <linux/cdrom.h>
+ #include <linux/fd.h>
+-#include <linux/fs.h>
+ #include <linux/hdreg.h>
+ #include <linux/input.h>
+ #include <linux/ioctl.h>
+@@ -855,10 +854,10 @@
+   unsigned IOCTL_EVIOCGPROP = IOCTL_NOT_PRESENT;
+   unsigned IOCTL_EVIOCSKEYCODE_V2 = IOCTL_NOT_PRESENT;
+ #endif
+-  unsigned IOCTL_FS_IOC_GETFLAGS = FS_IOC_GETFLAGS;
+-  unsigned IOCTL_FS_IOC_GETVERSION = FS_IOC_GETVERSION;
+-  unsigned IOCTL_FS_IOC_SETFLAGS = FS_IOC_SETFLAGS;
+-  unsigned IOCTL_FS_IOC_SETVERSION = FS_IOC_SETVERSION;
++  unsigned IOCTL_FS_IOC_GETFLAGS = _IOR('f', 1, long);
++  unsigned IOCTL_FS_IOC_GETVERSION = _IOR('v', 1, long);
++  unsigned IOCTL_FS_IOC_SETFLAGS = _IOW('f', 2, long);
++  unsigned IOCTL_FS_IOC_SETVERSION = _IOW('v', 2, long);
+   unsigned IOCTL_GIO_CMAP = GIO_CMAP;
+   unsigned IOCTL_GIO_FONT = GIO_FONT;
+   unsigned IOCTL_GIO_UNIMAP = GIO_UNIMAP;
+
+