win32/Makefile.sub (MAKEDIRS): define.
* common.mk (capi): using $(MAKEDIRS), so depends on $(PREP).
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24636 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
win32/Makefile.sub (MAKEDIRS): define.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24636 b2dd03c8-39d4-4d8f-98ff-823fe69b080e