Make gnupg-2.0.x patches version independent
* patches/gnupg2-2.0.29: Move to gnupg2 patches. * Makfile.am (EXTRA_DIST): Update accordingly.
Forgetting to update the patches directory led to regressions
with gpg4win 2.3.1 and it is unlikely that the patches
will be applied to a gnupg-2.0.x release. They are upstream
in 2.1.x.