[CMake] Autolink static libraries for foundation_static build

[jmschonfeld]

For private dependencies, the compiler needs to know to link the extra static libraries when building against the static stdlib. These extra flags ensure that when linking against libFoundationEssentials.a that the compiler also links lib_CShims.a and lib_FoundationCollections.a and that when linking against libFoundationInternationalization.a that the compiler also links lib_CShims.a and lib_FoundatonICU.a