symbols-check: Add __cxa_guard_* to the list of approved symbols.

These are introduced by the compiler during static local initialization in
c++ for thread safety.  This seems to end up being public in the driver
with --static-libc++ on android.

Reviewed-by: <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6700>
1 file changed