Cruft removal

Not sure when the last time these files were used, but it couldn't have been
recent.

install/sbbs_src.exclude

-CVS
-CVS/*
-*.o
-*.d
-*.bat
-*.~*
-.#*
-bcc.*
-gcc.*

install/sbbs_src.lst

-install/GNUmakefile
-install/termcap
-install/terminfo
-include/mozilla
-src/xpdev
-src/uifc
-src/sbbs3
-ctrl
-text
-docs
-exec
-xtrn
-node1
-node2
-node3
-node4

install/tarlibs.sh

-#/bin/sh
-tar cvzf lib-linux.tgz lib/mozilla/*/linux.*/*.so
-tar cvzf lib-freebsd.tgz lib/mozilla/*/freebsd.*/*.so
-tar cvzf lib-openbsd.tgz lib/mozilla/*/openbsd.*/*.so
-tar cvzf lib-unix.tgz lib/mozilla/*/*/*.so

install/tarsrc.sh

-#/bin/sh
-tar -cvzf sbbs_src.tgz -X install/sbbs_src.exclude -T install/sbbs_src.lst