Support diffs including binary files

[samatcodeapprove]

If I add a binary file to my project, the patch contains an entry like this:

diff --git a/functions/src/bin/mycmd b/functions/src/bin/mycmd
new file mode 100755
index 0000000..998a95d
Binary files /dev/null and b/functions/src/bin/mycmd differ

However using combinediff on a diff like this (with other files included) ignores this entry completely, probably because it lacks a hunk link (@@).

[twaugh]

Oh, I thought the PR I just linked (git diff support in filterdiff) would help but this is about combinediff, so it's unlikely to help.