Added initialization of sa_flags field in sigaction structure.
Added initialization of sa_flags field in sigaction structure.

myokoym/groonga,naoa/groonga,redfigure/groonga,kenhys/groonga,redfigure/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,naoa/groonga,naoa/groonga,groonga/groonga,naoa/groonga,myokoym/groonga,komainu8/groonga,kenhys/groonga,hiroyuki-sato/groonga,redfigure/groonga,cosmo0920/groonga,redfigure/groonga,hiroyuki-sato/groonga,kenhys/groonga,komainu8/groonga,myokoym/groonga,naoa/groonga,komainu8/groonga,naoa/groonga,groonga/groonga,kenhys/groonga,komainu8/groonga,myokoym/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,redfigure/groonga,myokoym/groonga,komainu8/groonga,myokoym/groonga,hiroyuki-sato/groonga,kenhys/groonga,groonga/groonga,kenhys/groonga,groonga/groonga,myokoym/groonga,hiroyuki-sato/groonga,groonga/groonga,cosmo0920/groonga,cosmo0920/groonga,komainu8/groonga,naoa/groonga,komainu8/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,groonga/groonga,cosmo0920/groonga,kenhys/groonga,redfigure/groonga,groonga/groonga,cosmo0920/groonga,redfigure/groonga,groonga/groonga,myokoym/groonga,naoa/groonga,redfigure/groonga,kenhys/groonga,hiroyuki-sato/groonga,komainu8/groonga