[Bug sanitizer/64435] [5 Regression] Bootstrap failure in libsanitizer on AArch64 with Linux kernel <= 3.15

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64435

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
In the #c9 patch obviously I meant to write __GLIBC_PREREQ (2, 21) instead of
__GNUC_PREREQ (2, 21), finger memory apparently doesn't work always well.
And there probably needs to be
#ifndef __GLIBC_PREREQ
#define __GLIBC_PREREQ(major, minor) 0
#endif
somewhere before that, as otherwise it will fail on non-Linux.