[distcc] Support for Sun Studio 11

[Greg Earle]

I haven't seen anything posted on this list about using non-GCC
compilers since last September.  Has anything changed in this
regard?  I can't believe I'm the only one who is forced to use
non-GCC compilers in some instances (I do use it for most of
my "system"-type stuff that I build).

I'm beta-testing Sun Studio 11 in my organization (we're still
back on Sun Forte 6 Update 2, if you can believe it - the
wheels of industry grind slowly where I work) and have a
ridiculously slow (rack-mounted Sun Ultra 60 clone by Tatung)
machine to build on - and I'm building large things, such as
Firefox 2.0.0.3 (which took 9 hours to build last night),
SeaMonkey 1.1.1 (even longer), and large subsystems of our own
code.  We're constrained to use Sun's compilers (existing
practice) and the Mozilla stuff needs to use them as well since
we need the Java plug-in and the Sun-provided one was built with
Sun's compilers and it's a shared object.  Suggestions to "Just
use GCC" will be cheerfully ignored  :-)

    - Greg