21.2-b28 CVS as of today. dll_open() lossage.

Had a link error, which chased down to the Athena3D hack in device-x.c:x_init_device(). Basic problem was that the code tested for HAVE_DLOPEN, which AIX has defined because there's a perfectly good dlopen() call in /usr/lib/libdl.a. However, I don't have a dll_open() or dll_function() or dll_close(). I hand-hacked around it by just sticking a #ifndef _AIX around it, but the right answer is to either use the routines that HAVE_DLOPEN checks for, or add another configure.in test for dll_* routines and associated #define. -- Valdis Kletnieks Operating Systems Analyst Virginia Tech