Compiling eduke32 outside of a Git repository inserts an error string in place of the revision number

To reproduce, simply rename the .git folder to something else, and then run make.

When starting the game, the first line in the log will show the following (I compiled for Fury in this case):

Ion Fury rfatal: not a git repository (or any of the parent directories): .git[fatal: not a git repository (or any of the parent directories): .git]-fatal: not a git repository (or any of the parent directories): .git

This means that the error case isn't being properly handled right now.

Since this is a likely result of someone downloading the source code in zipped format, it should be resolved.