thread.c: remove redundant USE_SIGALTSTACK #define
thread.c already includes vm_core.h where USE_SIGALTSTACK is defined, #include it explicitly (eval_intern.h already includes it)
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62473 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
thread.c: remove redundant USE_SIGALTSTACK #define
thread.c already includes vm_core.h where USE_SIGALTSTACK is
defined, #include it explicitly (eval_intern.h already includes
it)
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62473 b2dd03c8-39d4-4d8f-98ff-823fe69b080e