gRPC uses `upb`, but normally it vendors-in the dependency. The
vendored-in version uses a single library artifact, and the generated
pkg-config file simply adds `-lupb`. In `vcpkg` we use the `upb`
package. This has more libraries, and thus more `-lupb_*` options are
needed. Ideally we would use a `upb.pc` file, but that does not exist.
* move boost out of the toolchain
* move icu out of the toolchain
* remove CURL from the toolchain (was already unreachable?)
* remove gsl from toolchain
* remove grpc from toolchain
* version stuff
* fix indent and missing endif()
* version stuff
* Revert changes to vcpkg.cmake
* push port version
* version stuff
