RUBY_USE_SETJMPEX
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55471 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
RUBY_USE_SETJMPEX
include setjmpex.h only when using setjmpex() for RUBY_SETJMP.
the header of mingw32 overrides setjmp() by setjmpex().
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55471 b2dd03c8-39d4-4d8f-98ff-823fe69b080e