[patch][boehm-gc update] Don't use the renamed libgc library

[Matthias Klose]

libobjc and libjava don't use the renamed libgc library anymore. It's better to
have this change in libobjc/libjava than tracking the diffs in boehm-gc.

a multilib build configured with --enable-objc-gc works and doesn't show
regressions in the objc tests.

Committed to the branches/gcj/bdwgc-20121125-merge branch.

  Matthias

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