Use gcc to build shared objects (Phil Oester <kernel@linuxace.com>)

Use gcc to build shared objects (Phil Oester <kernel@linuxace.com>)

As suggested by Dmitry Levin and included in Fedora Core releases,
use gcc instead of ld to link shared objects.  Fedora rpm notes
refer to this fixing a plugin problem, but does not offer specifics.
But in any event, 'gcc -dumpspecs' does show gcc will pass a number
of parameters which in theory it thinks are better.

Compile tested both with and without NO_SHARED_LIBS.

Closes bug #454.