add a warning message to the bzr PKGBUILDS

and abort makepkg if it is run
They are only there for historical reasons

burg-bzr/PKGBUILD

+echo "Unmaintained by upstream; we don't use it anymore"
+exit; # aborts makepkg
 #
 # Core Packages for Chakra, part of chakra-project.org
 #

burg-emu/PKGBUILD

+echo "Unmaintained by upstream; we don't use it anymore"
+exit; # aborts makepkg
+
 #
 # Core Packages for Chakra, part of chakra-project.org
 #

burg-themes/PKGBUILD

+echo "Unmaintained by upstream; we don't use it anymore"
+exit; # aborts makepkg
+
 #
 # Core Packages for Chakra, part of chakra-project.org
 #