This reverts commit 69b6fe0d.

It broke horribly as expected :-) Trick is that if package is not found, the
dependency is mallformed anyway, so it is better to just get rid of it and hope
for the best than to break with weird error. Correct solution would be exiting
with the correct error but first of all make dependencies accross feeds work.

package-metadata.pl is currently not generating dependency if there is
no such package. This just hacks that away and generates that dependency
all the time. This might break horribly.

Yes grand new and innovative version. Well I had need to be able to not
only roll with branch also to optionally to latest tag only. This in
reality are two scripts. autopkg-branch to replace original pkguato and
autopkg-tag to track latest tagged version.

Previous change to compile_fw broken execution in clean directory
(without git). compile_fw could not been run, not even to display help.

This commit changes how configuration is applied to git tree of OpenWRT.
It is used only when needed and never set to git tree it self.

This introduces new _git function. This function is not required to be
used every time but for `git commit` and `git am` it is necessary to use
it instead of plain git.