Add -fvisibility=hidden compiler option for client library build and
export public library symbols.  Fix SConscript dependency logic to
compute dependencies for libraries.  Add client library to RPM
package.

	modified:   SConstruct
	modified:   bruce.spec.in
	modified:   bruce_noconfig.spec.in
	modified:   build_all
	modified:   src/SConscript
	new file:   src/base/export_sym.h
	modified:   src/bruce_client/bruce_client.h
	modified:   src/bruce_client/libbruce_client.cc