file.c: birthtime on Windows

* file.c (stat_birthtime): `ctime` is actually `created time` on Windows.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46049 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
extmk.rb: non-installed extensions when statick-linked-ext

* ext/extmk.rb: exclude extension libraries not to be installed if
  `--with-statick-linked-ext` is set, not only shared library is
  not built.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46050 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
jis/props.kwd: constify

* enc/jis/props.kwd (PropertyList): constify table itself.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46051 b2dd03c8-39d4-4d8f-98ff-823fe69b080e