Update to 1.2.
In theory, this version can be told to build against Thunderbird 1.5,
but I'm not going to tweak this port to do so until Tb 1.5 is released.
Apply a couple clean-ups.
- Ditch pkg-message/%%DATADIR%% substitutions in favour
of SUB_FILES and files/pkg-message.in.
- Remove a rather horrific shell command used to generate
a list of include dirs for c++(1). I'm not sure why it
works without the shell command... or more specifically,
I'm not sure what caused me to write it in the first place.
In any event, it builds cleanly here as-is. I'm sure Kris
will happily inform me of the inevitable breakages.
- Space the Makefile a bit better.