extras/tools: update ignore files

Ignore downloaded archives / subfolders and files generated by make.
Signed-off-by: Rafaël Carré <funman@videolan.org>
(cherry picked from commit 44465a73)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

extras/tools/.gitignore

@@ -2,5 +2,7 @@ Makefile
 .*
 */
 build/
+.*
+*/
 *.tar.gz
 *.tar.bz2