* version.h (RUBY_PATCHLEVEL): update patchlevel to 351.
  fix commit miss of r43732. [ruby-core:58444] [Backport #9131]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@43741 b2dd03c8-39d4-4d8f-98ff-823fe69b080e