GNU patch has gained the ability to do binary file renames based on git

headers, which was breaking the patcher (since we assumed we had to do

it ourselves). This change adds a check to see if the rename happened

already, and avoid crashing if so.
This also adds a test which simulates this situation even for systems

with older patch versions.

Ran unit tests.
Tested that a moved binary file worked correctly with the newer patch

  version.