Dots in filenames handled incorrectly

[cgay]

I put a file named descriptor.pb.dylan in the LID file, exactly as shown (i.e., with the .dylan extension) and got this from the build:

Internal error: Link failed: don't know how to build <protocol-buffers>descriptor.bc

Renaming the file to descriptor-pb.dylan works. I don't immediately see where the broken code is, so I'm filing this as a reminder to myself. One possible way this could happen is if the LID parsing code is correct but later down the line some other code still thinks it's necessary to strip any extension?