fgen @0.3: should be noarch, possibly platforms any

[ryandesign (Ryan Carsten Schmidt)]

fgen doesn't install any architecture-specific files:

% port -q installed fgen
  fgen @0.3_1 (active)

% file $(port -q cont fgen) 
/opt/local/bin/f2html:                 Perl script text executable
/opt/local/bin/fgen:                   Perl script text executable
/opt/local/share/doc/fgen/CHANGES:     ASCII text
/opt/local/share/doc/fgen/INSTALL:     ASCII text
/opt/local/share/doc/fgen/README:      ASCII text
/opt/local/share/doc/fgen/TODO:        ASCII text
/opt/local/share/man/man1/f2html.1.gz: gzip compressed data, max compression, from Unix, original size modulo 2^32 6446
/opt/local/share/man/man1/fgen.1.gz:   gzip compressed data, max compression, from Unix, original size modulo 2^32 6745

So it should be marked supported_archs noarch:

supported_archs noarch

This way, only one archive needs to be built and stored per OS version.

If the installed files do not vary by OS or OS version, then it should additionally be marked platforms any (instead of platforms darwin):

platforms any

This way, only one archive needs to be built and stored period.