Make sure that all .mar files required for generating incremental ones on OS X contain code-signed bits
While doing the 6.5a3 release it occurred to me we need to make sure every time we create the incrementals for OS X all involved full .mar files contain the code-signed bits. Otherwise the incremental files will fail.
We should have a check for this as this is easily forgotten, especially if different people are creating the .incremental mar files.