fix places where _BSD_SOURCE failed to yield a superset of _XOPEN_SOURCE
[musl] / arch / arm /
drwxr-xr-x   ..
-rw-r--r-- 2661 atomic.h
drwxr-xr-x - bits
-rw-r--r-- 160 crt_arch.h
-rw-r--r-- 572 pthread_arch.h
-rw-r--r-- 735 reloc.h
drwxr-xr-x - src
-rw-r--r-- 2189 syscall_arch.h