Remove redundant includes from nob.c

nob.c

@@ -1,11 +1,3 @@
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdbool.h>
-#include <stdarg.h>
-#include <string.h>
-#include <errno.h>
-
 #define NOB_IMPLEMENTATION
 #define NOB_STRIP_PREFIX
 #define NOB_EXPERIMENTAL_DELETE_OLD