Remove some commented-out code I've never seen used. If anyone screams we can put it back.

ext/extconf.rb

@@ -62,10 +62,5 @@ def create_header
   }
 end
 
-#if lib_ok
 create_header
 create_makefile('bdb')
-#else
-#  $stderr.puts("cannot create Makefile")
-#  exit 1
-#end