added glu.exports files to tarballs list

Makefile

diff --git a/Makefile b/Makefile
index 13f6422..2e86d11 100644
--- a/Makefile
+++ b/Makefile
@@ -340,6 +340,8 @@
 	$(DIRECTORY)/src/glu/sgi/glu.def				\
 	$(DIRECTORY)/src/glu/sgi/dummy.cc				\
 	$(DIRECTORY)/src/glu/sgi/descrip.mms				\
+	$(DIRECTORY)/src/glu/sgi/glu.exports				\
+	$(DIRECTORY)/src/glu/sgi/glu.exports.darwin			\
 	$(DIRECTORY)/src/glu/sgi/mesaglu.opt				\
 	$(DIRECTORY)/src/glu/sgi/include/gluos.h			\
 	$(DIRECTORY)/src/glu/sgi/libnurbs/interface/*.h			\