rapids cpm patches now support differences in white space.

[robertmaynard]

Description

Sometimes projects trim trailing whitespace from diffs, which causes them to not match the source. This allows us to handle those diff files

Checklist

• [x] I am familiar with the Contributing Guidelines.
• [x] New or existing tests cover these changes.
• [x] The documentation is up to date with these changes.

[robertmaynard]

/merge