Update the port to the latest available sources from SVN (r25) as suggested
by Rick C. Petty. This is achieved by patches that update all the affected
files (ignoring the "import" sub-directory, which is not used for the port)
to match the versions in SVN.
These patches do also include a fix for the Scons incompatibility that caused
the port to be broken for some time.
Thanks go to Rick C. Petty for bringing the SVN version to my attention and
his effort to get the port fixed.