Performance is not really important and dlsym(0, ...) is
not defined while the more correct dlsym(RTLD_DEFAULT, ...)
is a GNUism (although POSIX does reserve RTLD_DEFAULT).
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@29224 b3059339-0415-0410-9bf9-f77b7e298cf2