Log Message:
pkgtools/url2pkg: fix parsing of mk/fetch/sites.mk

Before, the final line of each MASTER_SITE_* definition had been skipped
because it didn't end with a backslash. That part of the regular
expression had always been intended to be optional. That bug lasted
almost 13 years, which is remarkably long but not the record.

The mk/fetch/sites.mk is now closed properly, which has gone unnoticed
for almost 13 years as well.

Google Code doesn't exist anymore, therefore there's no point in keeping
it.