* Makefile.in (SHOPT): New macro, flag to ld to create
        shared library.  Defaults to "-shared".
        (SHLIB): Use new SHOPT rather than hardcoded "-shared".
        * configure.in: While configuring for *-*-beos*, if
        --enable-shared is given, add beos.ml to list of makefile
        frags.
        * config/beos.ml: New file.

From-SVN: r31373