dln.c: xmalloc_mismatch_p with dlopen
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61576 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
dln.c: xmalloc_mismatch_p with dlopen
otherwise dlsym is not available too, and should be used then.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61576 b2dd03c8-39d4-4d8f-98ff-823fe69b080e