package/gcc: disable libsanitizer for mips{el} and gcc > 12

Since [1], gcc contains a workaround for struct_kernel_stat_sz
definition and apply a local patch when updating libsanitizer with
upstream (llvm-project) [2].

Since gcc 12, the workaround is not enough and trigger the following
error:

In file included from ../../../../libsanitizer/sanitizer_common/sanitizer_platform_limits_linux.cpp:21:
../../../../libsanitizer/sanitizer_common/sanitizer_platform_limits_linux.cpp:75:38: error: static assertion failed
   75 | COMPILER_CHECK(struct_kernel_stat_sz == sizeof(struct stat));
      |                ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Disable libsanitizer for now.

Note: Only glibc toolchains are affected since libsanitizer is
disabled for musl and uClibc-ng	toolchains [3].

Fixes:
https://gitlab.com/kubu93/toolchains-builder/-/jobs/2510178606

[1] http://gcc.gnu.org/ml/gcc/2018-03/msg00133.html
[2] https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=9f943b2446f2d0a345bbf9b4be3d3a4316372270
[3] https://git.buildroot.net/buildroot/commit/?id=5f4d658d888b539de9a6247ae5b1a0999de5d4ec

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gcc/gcc.mk

@@ -142,6 +142,12 @@ ifeq ($(BR2_mips64)$(BR2_mips64el):$(BR2_MIPS_NABI32),y:y)
 HOST_GCC_COMMON_CONF_OPTS += --disable-libsanitizer
 endif
 
+# libsanitizer bundled in gcc 12 fails to build for mips32 due to
+# mixing kernel and user struct stat.
+ifeq ($(BR2_mips)$(BR2_mipsel):$(BR2_TOOLCHAIN_GCC_AT_LEAST_12),y:y)
+HOST_GCC_COMMON_CONF_OPTS += --disable-libsanitizer
+endif
+
 # The logic in libbacktrace/configure.ac to detect if __sync builtins
 # are available assumes they are as soon as target_subdir is not
 # empty, i.e when cross-compiling. However, some platforms do not have