Add _Fork() to POSIX header tests.
https://pubs.opengroup.org/onlinepubs/9799919799/functions/fork.html
Change-Id: I98607284c6135642e8ab80e418cdb6058c12878f
diff --git a/tests/headers/posix/unistd_h.c b/tests/headers/posix/unistd_h.c
index 0b2cee5..f66609d 100644
--- a/tests/headers/posix/unistd_h.c
+++ b/tests/headers/posix/unistd_h.c
@@ -331,6 +331,9 @@
FUNCTION(fdatasync, int (*f)(int));
FUNCTION(fexecve, int (*f)(int, char* const[], char* const[]));
FUNCTION(fork, pid_t (*f)(void));
+#if !defined(__GLIBC__) // Our glibc is too old.
+ FUNCTION(_Fork, pid_t (*f)(void));
+#endif
FUNCTION(fpathconf, long (*f)(int, int));
FUNCTION(fsync, int (*f)(int));
FUNCTION(ftruncate, int (*f)(int, off_t));