[cairo] glitz build patch

[Carl Worth]

On Wed, 12 May 2004 21:00:20 +0100, Dave Beckett wrote:
> 'make distcheck' doesn't work in glitz because of the use of conditional
> sources in the src/Makefile.am if (like me, for example) you don't
> have both of glx and agl around.  That means the sources don't get
> put in the tarball.  You need to ensure all conditional sources are
> in EXTRA_DIST or in EXTRA_libglitz_la_SOURCES

I just noticed this in the automake manual this afternoon and realized
we'd need to fix things.

The manual suggests that conditional increments (with +=) to
libglitz_la_SOURCES will work as well. That would be a bit cleaner I
think.

-Carl