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Fix cross-compiling with dlltool for raw-dylib Fix for #103939 Issue Details: When attempting to cross-compile using the `raw-dylib` feature and the GNU toolchain, rustc would attempt to find a cross-compiling version of dlltool (e.g., `i686-w64-mingw32-dlltool`). The has two issues 1) on Windows dlltool is always `dlltool` (no cross-compiling named versions exist) and 2) it only supported compiling to i686 and x86_64 resulting in ARM 32 and 64 compiling as x86_64. Fix Details: * On Windows always use the normal `dlltool` binary. * Add the ARM64 cross-compiling dlltool name (support for this is coming: https://sourceware.org/bugzilla/show_bug.cgi?id=29964) * Provide the `-m` argument to dlltool to indicate the target machine type. (This is the first of two PRs to fix the remaining issues for the `raw-dylib` feature (#58713) that is blocking stabilization (#104218))