Really ignore generated distribution material.

Signed-off-by: Junio C Hamano <junkio@cox.net>

.gitignore

@@ -93,7 +93,8 @@ git-verify-pack
 git-verify-tag
 git-whatchanged
 git-write-tree
-#*.tar.gz
+git-core-*/?*
-#*.dsc
+*.tar.gz
-#*.deb
+*.dsc
-#git-core.spec
+*.deb
+git-core.spec