Fix inclusion of binary file changes in Perforce diffs.

Review Request #10326 — Created Nov. 19, 2018 and submitted — Latest diff uploaded

Information

RBTools
release-1.0.x
c09cb82...

Reviewers

The diff code for Perforce clients was mistakenly filtering out changes
to binary files. This change fixes it.

Created a perforce client with a change to a binary file. Before,
posting the changeset would show only the text files. After, it shows
the expected "This is a binary file" line in the diff viewer.