Drop inapplicable copyright statements.

Drop inapplicable copyright statements.

I had put these in here since I had originally planned to copy
liberally from the body of the implementation of 'compile in order
to get process output into a buffer. But once I found call-process
in the documentation of emacs, that was all I needed.

And all the code I've written since has been entirely my own with
just the help of emacs documentation.