Avoid use of newlocale(3) that results in increasing memory usage

--- CMakeLists.txt.orig	2020-07-26 15:08:19 UTC
+++ CMakeLists.txt
@@ -177,7 +177,7 @@ if (HAVE_STDLIB_H)
 endif()
 if (HAVE_LOCALE_H)
     check_symbol_exists(setlocale   "locale.h" HAVE_SETLOCALE)
-    check_symbol_exists(uselocale   "locale.h" HAVE_USELOCALE)
+    # check_symbol_exists(uselocale   "locale.h" HAVE_USELOCALE)
 endif()
 if (HAVE_STRINGS_H)
     check_symbol_exists(strcasecmp  "strings.h" HAVE_STRCASECMP)