Log Message:
Update to 4.6.1, provided by Kai-Uwe Eckhardt.
Do not depend on libelf and binutils on Linux since the current pkgsrc
versions might effectively be downgrades and break stuff (this needs
a better solution, like e.g. updating them :) ).

Changes:
158 bugs fixed, see
http://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.6.1