Log Message:
Updated to version 1.42.

Patch from Jeremy C. Reed via PR pkg/20321.

Changes:

1.42:
=====
- modernize the constants code (from Nicholas Clark)

1.41:
=====
- At some point the ability to figure our the correct incdir
  for EXTERN.h (either a core perl build, or an installed perl)
  had broken (which lead into all test compiles failing with
  a core perl build, but thanks to the robustness of Makefile.PL
  nothing of was visible).  The brokenness seemed to be caused
  by $ENV{PERL_CORE} not being on for core builds?  Now stole
  a trick from the Encode that sets $ENV{PERL_CORE} right, and
  both styles of build should work again.

1.40:
=====
- Nicholas Clark noticed that the my_catdir() emulation function
  was broken (which means that we didn't really work for Perls
  5.002 and 5.003)
- inspired by fixing the above made the whole Makefile.PL -w
  and strict clean
- tightened up the Makefile.PL output, less whitespace

1.39:
=====
- fix from Craig Berry for better building in VMS with PERL_CORE