src: #include <stdio.h>" to iculslocs

iculslocs uses stdio, but didn't include the header.

Backport-PR-URL: #22380
PR-URL: #19150
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

Author: srl295

tools/icu/iculslocs.cc

@@ -55,6 +55,7 @@ Japanese, it doesn't *claim* to have Japanese.
 #include <unicode/ures.h>
 #include <unicode/udata.h>
 #include <unicode/putil.h>
+#include <stdio.h>
 
 const char* PROG = "iculslocs";
 const char* NAME = U_ICUDATA_NAME;  // assume ICU data