[PATCH 0/3] MR5478: winegcc/winebuild: Add -marm64x option support.

[Jacek Caban (＠jacek)]

On MSVC, building hybrid ARM64X images requires executing linker directly, with `-machine:arm64x` option, there is not way to use the compiler as a linker driver in such case.

Clang git version has `-marm64x` option now, which allows using it as a linker driver for ARM64X builds. This MR adds a similar option to winegcc and winebuild. For winegcc, we need to build spec file objects for both targets (native and EC). winebuild uses a new llvm-dlltool option `-N`, which works like MSVC lib.exe's `/defArm64Native` and allows passing .def files for both targets to generate a hybrid import library.