Ensure gcc44 used on DragonFly unless specified otherwise

In the absence of a defined DRAGONFLY_CCVER, dports will use gcc44 to
build ports unless USE_GCC > 4.4 or USE_GCC isn't specified.

This is to prevent surprises when DragonFly is changed to gcc 4.7 by
default.
Import astro/cfitsio version 3.310
Import lang/f77 version 0.3
Import astro/p5-Astro-FITS-CFITSIO version 1.09
Import biology/mopac version 7.1.11_1,1
Import math/blocksolve95 version 3.0_10
Import astro/p5-Astro-Catalog version 4.2.4
Import cad/tochnog version 20010211_6
Import astro/kstars version 4.8.4