lib/oe/patch: add support for extracting patches from git tree
When patches from a recipe have been written out to a git tree, we also
want to be able to do the reverse so we can update the patches next to
the recipe. This is implemented by adding a comment to each commit
message (using git hooks) which we can extract later on.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
