HEADS UP: port sparc64 switched to GCC 4.5.3

[matthew green <mrg%eterna.com.au@localhost>]

hi folks.


i've switched sparc64 to use GCC 4.5.3 by default.  the first port
to do so!  there shouldn't be any major issues, however update
builds won't work.  i recommend removing both destdir and objdir
before rebuilding.

if you need to revert this change, use build.sh -V HAVE_GCC=4.

let me know if there are problems!  thanks.


.mrg.