win32/setup.mak: check psapi.h

* win32/setup.mak (check-psapi.h): check if psapi.h is available.

* win32/win32.c (CHECK_CONSOLE_EMULATOR): enable console emulator DLL
  check only when psapi.h is available.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43307 b2dd03c8-39d4-4d8f-98ff-823fe69b080e