applied patch from Andrej Borsenkow <borsenkow.msk@sni.de> to also check

applied patch from Andrej Borsenkow <borsenkow.msk@sni.de> to also check

Wed Jan 27 01:57:19 1999  Tim Janik  <timj@gtk.org>

        * configure.in (G_MODULE_HAVE_DLERROR): applied patch from Andrej
        Borsenkow <borsenkow.msk@sni.de> to also check for dlsym() in system
        libraries and -ldl, to catch systems that provide dlopen() in libc
        and dlsym() in libdl. this is at least the case for Reliant UNIX
        5.44 (labeling itself as SINIX).