fix places where _BSD_SOURCE failed to yield a superset of _XOPEN_SOURCE
[musl] / arch / sh /
drwxr-xr-x   ..
-rw-r--r-- 1725 atomic.h
drwxr-xr-x - bits
-rw-r--r-- 258 crt_arch.h
-rw-r--r-- 290 pthread_arch.h
-rw-r--r-- 595 reloc.h
drwxr-xr-x - src
-rw-r--r-- 2800 syscall_arch.h