ci: add -Zshare-generics=off on windows

Author: Firestar99

.github/workflows/ci.yaml

@@ -43,7 +43,7 @@ jobs:
         run: sudo apt install libwayland-cursor0 libxkbcommon-dev libwayland-dev
       - if: ${{ runner.os == 'Windows' && matrix.integration == 'spirv-builder' }}
         name: Windows - set rustflags to make it compile
-        run: echo "RUSTFLAGS=\"-Zshare-generics=off\"" >> "$GITHUB_ENV"
+        run: echo "RUSTFLAGS=-Zshare-generics=off" >> "$GITHUB_ENV"
       # just need a random command that forces the installation of rust-toolchain
       # figure out native target triple while we're at it
       - name: install rust-toolchain