Fix version output
The version output is missing the first character of the commit date and the Git commit.
dfab: /tmp/frotz-2.52 % ./frotz -v
FROTZ V2.52 Curses interface. Audio output enabled.
Commit date: 020-05-09 23:39:31 -0700
Git commit: e35df9be595eb68f119bece0c570385bd387abf
Notes: Official release.
This PR fixes that by removing unnecessary $
s from the Makefile