X11R7.5 - remove all version information from Config.in files

As discussed on the list, don't want to have to change the Config.in
file when we bump the version of a package

Signed-off-by: Will Wagner <will_wagner@carallon.com>
Acked-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>