Make sure we have a mkfifo symbol.

Bug: https://code.google.com/p/android/issues/detail?id=58888
Change-Id: Ic0a883a5f30beb82cb7be3c4e81b6d693d5fbb4d
diff --git a/libc/include/sys/stat.h b/libc/include/sys/stat.h
index 95e83d8..84e367f 100644
--- a/libc/include/sys/stat.h
+++ b/libc/include/sys/stat.h
@@ -178,10 +178,7 @@
 #define  fstat64   fstat
 #define  lstat64   lstat
 
-static __inline__ int mkfifo(const char *__p, mode_t __m)
-{
-  return mknod(__p, (__m & ~S_IFMT) | S_IFIFO, (dev_t)0);
-}
+extern int mkfifo(const char*, mode_t);
 
 extern int  fstatat(int dirfd, const char *path, struct stat *buf, int flags);
 extern int  mkdirat(int dirfd, const char *pathname, mode_t mode);