cmake: improvements to cross-compiling for Windows

 * don't unconditionally pass -lz3 for mingw builds. If mingw builds
   require this then the llvm-config executable should put it as part of
   --system-libs. If there is a bug and it does not do that, and we need
   a workaround, then the workaround should be an explicit cmake option.
 * don't link libstage2.a against -lntdll. This causes zig to set
   `builtin.link_mode == .Dynamic` and include the TLS definitions,
   which then collide with the mingw-w64 symbols. This should probably
   be addressed separately, but for now this solves the problem and
   there is no reason to link a static library against a DLL.
 * Findllvm.cmake no longer treats the libraries as "optional" and will
   emit a cmake error if one is not found. Additionally, the
   not-required LLVM library LLVMTableGen is omitted.

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