Commits on Jun 27, 2022

1. Ensure that static_crt is set in the bootstrapper whenever using `c… …

   …c` to get a compiler command line.
   
   When attempting to build rustc with LLVM on Windows, I noticed that the CRT flag provided to the C and C++ Compilers was inconsistent:
   
   ```
   "-DCMAKE_C_FLAGS=-nologo -MT -Brepro" "-DCMAKE_CXX_FLAGS=-nologo -MD -Brepro"
   ```
   
   Since the bootstrapper also sets the various `LLVM_USE_CRT` variables, this resulted in cl.exe reporting a bunch of warnings:
   
   ```
   cl : Command line warning D9025 : overriding '/MD' with '/MT'
   ```
   
   The root cause for this is that `cc_detect::find` was creating a `cc::Build` twice, but didn't set `static_crt` the second time.
   
   It's possible that this what is also causing rust-lang#81381

   

   dpaoliello committed Jun 27, 2022
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