Unhide __pthread_cleanup_push and __pthread_cleanup_pop for 64-bit ABIs

Note that unwanted-symbols/{x86_64,mips64}/libc.so.functions.txt symlink
to arm64/libc.so.functions.txt

Change-Id: I9a2ebb0b810fe7396d7d546a877b59233a1fd7a8
1 file changed