Directory names should use $(PACKAGE_TARNAME), not $(PACKAGE)

[Ludovic Courtès]

Hello,

I recently changed Guile so that PACKAGE is “GNU Guile” (instead of
“guile”), while PACKAGE_TARNAME remains “guile”.

In doing so, I noticed that:

  1. $(distdir) is $(PACKAGE)-$(VERSION), but it should really be
     $(PACKAGE_TARNAME)-$(VERSION).

  2. $(pkglibdir), $(pkgdatadir), etc., all use .../$(PACKAGE), but I
     think it should really be .../$(PACKAGE_TARNAME).

Of course, all these can be worked around in ‘Makefile.am’, but I think
it would be nicer if Automake chose the “right” default.

What do you think?

Thanks,
Ludo’.