customcc/compilers.conf: Some adjustments and simplifications.
* pkgsrc's clang no longer needs special handling for C++ compilation.
* Use gcc44's cpp, gcc41 is gone.
* -dumpversion is now understool by both pkgsrc's and SVN trunk's
clang, so no special handling needed for that either.
Based on an older patch I did with Juan Francisco a year ago.
Reported-by: Juan Francisco Cantero Hurtado <iam@juanfra.info>
Joris Giovannangeli <joris@giovannangeli.fr>
Tested-by: Joris Giovannangeli <joris@giovannangeli.fr>
Dragonfly-bug: <http://bugs.dragonflybsd.org/issues/2205>