(rb_thread_blocking_region_end): marked as deprecated.
* include/ruby/backward/rubysig.h (TRAP_BEG): fix for C++. a
patch from Aman Gupta at [ruby-core:21934]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22130 b2dd03c8-39d4-4d8f-98ff-823fe69b080e