compat: Fix pipe prototype

compat/compat.c

@@ -4,7 +4,7 @@
 
 #include <fcntl.h>
 
-static inline int pipe(int fds[2])
+int pipe(int fds[2])
 {
     return _pipe(fds, 32768, O_NOINHERIT | O_BINARY);
 }