common.mk, win32/Makefile.sub: refix sizez.c for nmake

* common.mk (sizes.c): revert r42854 and r42883.

* win32/Makefile.sub (sizes.c): rule for outplace build.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42884 b2dd03c8-39d4-4d8f-98ff-823fe69b080e