Let LC_COLLATE influence string-comparison operations

By default this will be set to the C locale, but set it to the user's
locale when string comparisons are performed from mdb-sql. Note that
this can be overridden with the LC_COLLATE environment variable.

We could infer the collation locale from the file itself, but this will
likely require a big ball of glue between the Windows locales and Unix
ones.

src/util/mdb-sql.c

@@ -401,7 +401,7 @@ main(int argc, char **argv)
 		}
 	}
 
-
+	setlocale(LC_COLLATE, "");
 	/* initialize the SQL engine */
 	sql = mdb_sql_init();
 	if (argc == 2) {