packaging: use lower case for RC files The file case doesn't matter. I'm not sure why it is capitalized. This is a source of inconsistency between Inno and WiX. So let's standardize on the lower case names. The MSI should remove the old files before installing the new one, so there shouldn't be a problem with a case collision. And, users should not have modified these files, so it should be safe to rename them. Differential Revision: https://phab.mercurial-scm.org/D7172