tree-wide: sort includes

Sort the includes accoding to the new coding style.

src/test/test-sched-prio.c

@@ -21,8 +21,8 @@
 
 #include <sched.h>
 
-#include "manager.h"
 #include "macro.h"
+#include "manager.h"
 
 int main(int argc, char *argv[]) {
         Manager *m = NULL;