* common.mk (EXTMK_ARGS): needs MINIRUBY for cross-compile.
	  [ruby-core:20131]
	* common.mk (EXTMK_ARGS): shouldn't use ``\"'' because cmd.exe eat
	  ''\'' in such quotes.
	* common.mk (EXTMK_ARGS): needs MINIRUBY for cross-compile.
	  [ruby-core:20131]
	* mkconfig.rb (patchlevel): config.status may not contain
	  PATCHLEVEL even if other version numbers exist.
	* ext/extmk.rb: MINIRUBY is given via make-flag.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@26172 b2dd03c8-39d4-4d8f-98ff-823fe69b080e