Check tools with '-version' too

Some tools, like ant, have -version arg and not --version
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

extras/tools/bootstrap

@@ -44,7 +44,7 @@ fi
 }
 
 check() {
-if ! $1 --version >/dev/null 2>&1
+if ! $1 --version >/dev/null 2>&1 && ! $1 -version >/dev/null 2>&1
 then
     echo "$1 not found"
     NEEDED="$NEEDED .$1"