This re-adds/updates the boehm-gc configury and splits the ChangeLog into the
upstream ChangeLog and the gcc ChangeLog.

committed to the boehm-gc merge branch.

  Matthias

2012-12-01  Matthias Klose  <doko@ubuntu.com>

        * Rename ChangeLog to ChangeLog.gcc, removing upstream entries from
        ChangeLog.gcc.

[no diff included here]