- bsd.compiler.mk: Must ensure that the CCACHE_WRAPPER_PATH comes first
  in PATH.
- Makefile.inc1: Must prepend the CCACHE_WRAPPER_PATH into BPATH as it
  overrides the PATH set in bsd.compiler.mk in sub-makes.  The PATH
  set in bsd.compiler.mk is not exported and doing so would cause it to
  then override the BPATH set from environment.  The only sane solution
  is to prepend into BPATH as needed.
CCACHE_PATH could possibly be used for some of this as well.

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