K 10
svn:author
V 3
sjg
K 8
svn:date
V 27
2020-11-20T06:02:31.616561Z
K 7
svn:log
V 247
Merge bmake-20201117

o allow env var MAKE_OBJDIR_CHECK_WRITABLE=no to skip writable
  checks in InitObjdir.  Explicit .OBJDIR target always allows
  read-only directory.

o More code cleanup and refactoring.

o More unit tests

MFC after:	1 week

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