depend: fix for static library on mswin

* enc/depend (ARFLAGS): VisualC++ linker does not allow spaces between
  output option and the output file name.  [Bug #7950]
* enc/depend (RANLIB): set default command to do nothing, or make the
  entire line a label on Windows.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39489 b2dd03c8-39d4-4d8f-98ff-823fe69b080e