Basic support for runtime in shared library. Needs to be built with runtime/build-sharedlibs.sh and activated manually by providing -defaultlib=llvmdc-runtime-shared -defaultlib=tango-cc-tango-shared -defaultlib=tango-gc-basic-shared on llvmdc call at the moment. To support D shared libraries in non-D code, we need to remove the main() from libllvmdc-runtime-shared.

1) Do a checkout of tango trunk in the llvmdc root dir (along dmd, gen, runtime etc).

    *    svn co http://svn.dsource.org/projects/tango/trunk ../tango

2) Patch the runtime

    *    sh patch-tango.sh

3) Compile the runtime

    *    sh build.sh