set crt-static in msvc builds

Author: Heliozoa

.github/workflows/upload-binaries.yml

@@ -46,10 +46,11 @@ jobs:
         run: |
           rustup target add i686-pc-windows-msvc
           cargo build -p tmc-langs-cli --release --verbose --target ${{ matrix.target }}
-      - name: Deploy
+      - name: Deploy  # crt-static is set with RUSTFLAGS to statically link MSVCRT (VCRUNTIME140.dll)
         run: |
           $env:python_version=$(python -c 'import sys; print(\".\".join(map(str, sys.version_info[:3])))')
           $env:CLOUDSDK_PYTHON="C:\hostedtoolcache\windows\Python\$env:python_version\x64\python"
+          $env:RUSTFLAGS="-C target-feature=+crt-static"
           gsutil cp target/${{ matrix.target }}/release/tmc-langs-cli.exe gs://${{ secrets.GCP_BUCKET }}/tmc-langs-rust/tmc-langs-cli-${{ matrix.target }}-$Env:TAG.exe
 
   macos: