Updated MESSAGE file to reflect current
* Fix library id on Darwin.
* Pass CC and CFLAGS.
* Added LICENSE.
* Removed USE_LIBTOOL and TEST_TARGET: these are not used with Scons build.
Register patch for configure.ac again, and touch some files to avoid
invoking autoconf/automake.
Taken from devel/glib2.
Touch more dependency files, fix build on DragonFly/amd64 3.4.1.