Move local include to before system includes

Prevents accidental missing includes and hidden dependencies in the local file.

Author: danra

src/compat/endian.h

@@ -9,10 +9,10 @@
 #include "config/bitcoin-config.h"
 #endif
 
-#include <stdint.h>
-
 #include "compat/byteswap.h"
 
+#include <stdint.h>
+
 #if defined(HAVE_ENDIAN_H)
 #include <endian.h>
 #elif defined(HAVE_SYS_ENDIAN_H)