tools: remove unused vector include in mkdcodecache

PR-URL: #33828
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: danbev

tools/code_cache/mkcodecache.cc

@@ -3,7 +3,6 @@
 #include <iostream>
 #include <sstream>
 #include <string>
-#include <vector>
 
 #include "cache_builder.h"
 #include "debug_utils-inl.h"