after-gc-hook recently broken for bdwgc 7.2alpha CVS

[Mark H Weaver]

Sometime between 2.0.0 and current stable-2.0, after-gc-hook has been
broken on my system: "FAIL: gc.test: gc: after-gc-hook gets called".

Both 2.0.0 and current stable-2.0 are built and linked with bdwgc
7.2alpha from CVS, circa 2011-03-27.  This on gNewSense metad/mipsel
(slightly modified Debian Lenny).

Any ideas?

   Best,
    Mark