util: valgrind.sh: Find suppressions regardless of current dir

Author: any1

util/valgrind.sh

@@ -1,6 +1,8 @@
-#!/bin/sh
+#!/bin/bash
+
+SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
 
 valgrind --leak-check=full \
 	--show-leak-kinds=all \
-	--suppressions=util/valgrind.supp \
+	--suppressions=$SCRIPT_DIR/valgrind.supp \
 	$@