Rename global.h to util.h

The functionality has changed since we no longer need a place for global
variables.

src/arg_parse.c

@@ -17,6 +17,9 @@
  */
 #include "arg_parse.h"
 
+#include "util.h"
+#include <string.h>
+
 enum cmd_id parse_args(const char *cmd) {
 	for(int i = 0; i < (int)ARRAY_LEN(commands); ++i) {
 		for(int j = 0; j < (int)ARRAY_LEN(commands[i].str); ++j) {

src/arg_parse.h

@@ -17,11 +17,6 @@
  */
 #pragma once
 
-#include <string.h>
-#include <stdio.h>
-
-#include "global.h"
-
 enum cmd_id {
 	CMD_UNKNOWN = 0,
 	CMD_HELP,