- Added pkg-config files (.pc.in), so after the library is installed you can

- Added pkg-config files (.pc.in), so after the library is installed you can
link to it with `pkg-config --cflags --libs chimara`.
- Plugins need <glib.h> to compile, for the definition of glui32 and glsi32
in glk.h; don't know why this worked before.
- Fixed libtool craziness. Apparently when you declare your plugins "noinst"
then libtool "figures out" that it doesn't need to build shared libraries.