Make pacman output in english so it can properly be parsed

If LANGUAGE is set to some language other than english (e.g. "de"), the
following matches might fail. By setting LC_ALL=C we override all user settings.
Remove unused variables and duplicate character classes

The check that was based on dep_spec has been removed in
c24bdad8abac23423d73488d8a6e00b63f959f0a

From http://www.ruby-doc.org/core-2.1.2/Regexp.html:
/\w/ - A word character ([a-zA-Z0-9_])
This includes \d
Merge pull request #2 from voidus/master

Make pacman output in english so it can properly be parsed