core.doxy was renamed to main.doxy, along with output folder in
the below 2004 commit.
Correct the other modules' TAGFILE linkage to find the main folder.
commit 3ef972f538
Author: Brian Paul <brian.paul@tungstengraphics.com>
Date: Sun May 16 22:07:02 2004 +0000
Replaced 'core' with 'main'.
Other minor updates.
Signed-off-by: Rhys Kidd <rhyskidd@gmail.com>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Rewrite the Makefile in order to avoid the double pass when the tag files already exist. A double pass can still be achieved by doing 'make clean all'.