See the string "GDBM version".

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33962 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/dbm/test_dbm.rb

@@ -105,7 +105,7 @@ if defined? DBM
     end
 
     def test_s_open_no_create
-      skip "dbm_open() is broken on libgdbm 1.8.0" if /1\.8\.0/ =~ DBM::VERSION
+      skip "dbm_open() is broken on libgdbm 1.8.0 or prior" if /GDBM version 1\.(?:[0-7]|8\.0)/ =~ DBM::VERSION
       assert_nil(dbm = DBM.open("#{@tmpdir}/#{@prefix}", nil))
     ensure
       dbm.close if dbm
@@ -529,7 +529,7 @@ if defined? DBM
     end
 
     def test_writer_open_notexist
-      skip "dbm_open() is broken on libgdbm 1.8.0" if /1\.8\.0/ =~ DBM::VERSION
+      skip "dbm_open() is broken on libgdbm 1.8.0 or prior" if /GDBM version 1\.(?:[0-7]|8\.0)/ =~ DBM::VERSION
       assert_raise(Errno::ENOENT) {
         DBM.open("#{@tmproot}/a", 0666, DBM::WRITER)
       }