tree-wide: sort includes

Sort the includes accoding to the new coding style.

src/basic/strxcpyx.c

@@ -27,6 +27,7 @@
 
 #include <stdio.h>
 #include <string.h>
+
 #include "strxcpyx.h"
 
 size_t strpcpy(char **dest, size_t size, const char *src) {