merge revision(s) 39445,39447:

	* signal.c (sigsegv): suppress unused result warning. Because
	  write(2) is marked __warn_unused_result__ on Linux glibc.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39671 b2dd03c8-39d4-4d8f-98ff-823fe69b080e