Makefile.sub: SIZEOF_CLOCK_T

* win32/Makefile.sub (config.h): now SIZEOF_CLOCK_T is needed for
  unsigned_clock_t.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42655 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-08-23

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e