[PATCH] fix GCC 4.9 libsanitizer build with old glibc

[Sandra Loosemore]

As reported in GCC PR 61021....

We build a native i686-pc-linux-gnu toolchain against a relatively 
ancient sysroot (glibc 2.4) so that the resulting binaries will work on 
a variety of  older GNU/Linux distros.  GCC 4.9 is now failing to build 
this configuration due to references to undefined symbols 
PTRACE_GETSIGINFO and PTRACE_SETSIGINFO in libsanitizer.  The attached 
patch is sufficient to get it to at least build again, and it's 
consistent with the way PTRACE_GETREGSET and PTRACE_SETREGSET are being 
handled.

If this is OK, can somebody please check it in, so the changes will 
eventually propagate back to GCC?

-Sandra
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