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This commit adds `hasSharedLibraries` to `lib.systems`. We need `plat.hasSharedLibraries` in order to know whether or not to expect `gcc` (and many other tools) to emit shared libraries (like `libgcc_s.so`). Many of the GNU build scripts are smart enough that if you configure them with `--enable-shared` on a platform (such as `arm-none-eabi`) that doesn't support dynamic linking, they will simply skip the shared libraries instead of aborting the `configurePhase`. Unfortunately the missing shared libraries in the final build product cause very hard-to-troubleshoot problems later on. The alternative to introducing `hasSharedLibraries` would be to set `isStatic` in these situations. However doing so causes `make-derivation.nix` to insert `-static` between the `pname` and `hostPlatform` suffix, which is undesirable. If at some point in the future we eliminate the `-static` suffix, then `hasSharedLibraries` can be made equal to `!isStatic`.