Clang: Detect lld-link when using gnu front end with msvc target
requested to merge teajay/cmake:CMAKE_LINKER_points_to_lld_link_for_msvc_with_clang_gnu_interface into master
The test condition used to select the linker lookup in CMakeFindBinUtils.cmake now matches the test condition used when configuring the clang front end in Windows-Clang.cmake.
I'm not 100% sure this change won't break some obscure corner case, but at least it seams logical.
Fixes: #21137 (closed)