Commits on Nov 7, 2022

1. boehmgc: disable SOFT_VDB on powerpc64le for version 8.2.2 …

   Upstream has not yet fixed the bug:
   
     ivmai/bdwgc#376
     ivmai/bdwgc#479
   
   However there is a recommended workaround:
   
     ivmai/bdwgc#479 (comment)
   
   This adds `CFLAGS_EXTRA=-DNO_SOFT_VDB` to the `makeFlags`, which
   prevents direct accesses to `/proc` being used for tracking dirtied
   pages (which must be rescanned):
   
     https://github.com/ivmai/bdwgc/blob/54522af853de28f45195044dadfd795c4e5942aa/include/private/gcconfig.h#L741
   
   The collector will fall back to using mprotect() to trigger page
   faults on writes to clean pages and maintain its own dirty bits,
   which is slightly less efficient but (in this case) more reliable.
   Unreliable page-dirtiness bits can lead to use-after-free()
   corruption; this is not a situation where disabling the tests is a
   good idea.

   Adam Joseph committed Nov 7, 2022
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2. rephrase to avoid mass-rebuild

   Adam Joseph committed Nov 7, 2022
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3. boehmgc: switch from versionAtLeast to == for powerpc workaround

   Adam Joseph committed Nov 7, 2022
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