test_gdbm.rb: open_db_child
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41424 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_gdbm.rb: open_db_child
child process and handshake using popen.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41424 b2dd03c8-39d4-4d8f-98ff-823fe69b080e