* include/ruby/win32.h, win32/Makefile.sub, win32/win32.c
  (clock_gettime): [experimental] emulates clock_gettime(2) of posix.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42557 b2dd03c8-39d4-4d8f-98ff-823fe69b080e