fix broken signal.h from header cleanup

include/signal.h

@@ -46,8 +46,6 @@ union sigval
 	void *sival_ptr;
 };
 
-#include <bits/signal.h>
-
 int __libc_current_sigrtmin(void);
 int __libc_current_sigrtmax(void);
 
@@ -92,6 +90,8 @@ typedef int (*sighandler_t)(int);
 void (*bsd_signal(int, void (*)(int)))(int);
 #endif
 
+#include <bits/signal.h>
+
 typedef int sig_atomic_t;
 
 void (*signal(int, void (*)(int)))(int);