pacman: list all unknown targets on removal operation
On a removal operation, pacman currently reports an error for the
package that is not found in the database and then exists. Adjust
so that all unknown packages are reported.
Before:
> pacman -R foo bar
error: 'foo': target not found
After:
> pacman -R foo bar
error: 'foo': target not found
error: 'bar': target not found