Adding static library building option. (#244)

* Adding static library building option.

* Disabling running tests for static build

* Removing static packaging in CI

Co-authored-by: Saad Rahim <saad.rahim@amd.com>

README.md

@@ -27,6 +27,7 @@ The root of this repository has a helper script 'install.sh' to build and instal
 *  `./install.sh -t` -- builds library including unit tests
 *  `./install.sh -r` -- runs unit tests (must be already built)
 *  `./install.sh -p` -- builds RCCL package
+*  `./install.sh -s` -- builds RCCL as a static library (default: shared)
 *  `./install.sh -hcc` -- builds RCCL with hcc compiler; note that hcc is now deprecated. (default:hip-clang)
 *  `./install.sh --prefix` -- specify custom path to install RCCL to (default:/opt/rocm)