Rust linker problem on windows when clang is present

[ur4t]

Describe the bug With clang present (exist in system path) and cl absent, meson generates build.ninja file using clang as linker. When removed clang, and left clang-cl, meson correctly uses lld-link as linker. When cl present, meson correctly uses link.exe as linker.

System parameters

• Clang 9.0.0 Target: x86_64-pc-windows-msvc
• Rustc 1.41.0 stable-x86_64-pc-windows-msvc
• MSVC 19.24
• Windows 10
• Python 3.8.1
• meson 0.53.1 or meson tuned by #6634 0.53.999
• ninja 1.10.0