* signal.c (check_stack_overflow): Don't use ucontext_t if ucontext.h
  is not available.
  Fixes build on Android (x86).



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45544 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-04-10

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45545 b2dd03c8-39d4-4d8f-98ff-823fe69b080e