Log Message:
Finally update Mesa and friends after the distfile changed on the website
without a version bump.  Changes made, according to the website, for
libtool/autofoo fixes.

Some changes from Ron Roskens:
glut depends upon graphics/glu (otherwise its linked against X11R6 libs)

MesaDemos:
 rather than using the pre-built distribution makefiles,
 use the automake/configure built makefiles which have
 the build dependencies all setup.

This closes PR pkg/23476.