Bug #4045: build error on mswin
http://redmine.ruby-lang.org/issues/show/4045

ɼ???: Usaku NAKAMURA
?????????: Assigned, ?????: Normal
???????: Nobuyoshi Nakada, ????????: build, Target version: 1.9.x
ruby -v: ruby 1.9.3dev (2010-11-12 trunk 29766) [x64-mswin64_100]

????????????r29756以??????ext/socket????????中?失?????????ruby???????????????中????????????????????????????????????
ext/socket/mkmf.log???尾??????以???????????????????????????????????????????????????????????????????????????????????????????????(???????????????????????????失踪???????????????????????????????????????????????????)???

???????????????????io.c?????r29755??巻???????????????????????????????????????????????????????????????????????IO????????????????????????????????????????????????????????????


C:/Users/usa/ruby/lib/mkmf.rb:282:in `initialize': Permission denied - mkmftmp1.log (Errno::EACCES)
	from C:/Users/usa/ruby/lib/mkmf.rb:282:in `open'
	from C:/Users/usa/ruby/lib/mkmf.rb:282:in `ensure in block in postpone'
	from C:/Users/usa/ruby/lib/mkmf.rb:285:in `block in postpone'
	from C:/Users/usa/ruby/lib/mkmf.rb:253:in `open'
	from C:/Users/usa/ruby/lib/mkmf.rb:275:in `postpone'
	from C:/Users/usa/ruby/lib/mkmf.rb:763:in `checking_for'
	from C:/Users/usa/ruby/lib/mkmf.rb:867:in `have_func'
	from C:/Users/usa/ruby/ext/socket/extconf.rb:348:in `<top (required)>'
	from ../mytree/ext/extmk.rb:156:in `load'
	from ../mytree/ext/extmk.rb:156:in `extmake'
	from ../mytree/ext/extmk.rb:443:in `block in <main>'
	from ../mytree/ext/extmk.rb:439:in `each'
	from ../mytree/ext/extmk.rb:439:in `<main>'


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