Add cc.exe copy (#231)

We use `cc` to check if the image is functioning properly.  Let's copy
the same check here.

.github/workflows/windows.yml

@@ -57,7 +57,7 @@ jobs:
 
       # Dump some debugging output to ensure everything works properly
       - run: docker images ${{ env.IMAGE_NAME }} --digests
-      - run: docker run ${{ env.IMAGE_NAME }} bash -c "gcc -dumpmachine; gcc --version"
+      - run: docker run ${{ env.IMAGE_NAME }} bash -c "cc -dumpmachine; cc --version"
 
       # Login to docker hub so we can push it up, but only do so on a tag
       - name: Login to Docker Hub

windows/package-i686/Dockerfile

@@ -28,7 +28,8 @@ RUN bash -l -c "pacman -Syuu --noconfirm --noprogressbar"  && \
 ARG GCC_DOWNLOAD_URL=https://github.com/niXman/mingw-builds-binaries/releases/download/12.2.0-rt_v10-rev0/i686-12.2.0-release-posix-sjlj-rt_v10-rev0.7z
 RUN powershell -Command "Invoke-WebRequest -Uri %GCC_DOWNLOAD_URL% -OutFile C:\windows\temp\gcc.7z" && \
     cd "C:\msys64" && \
-    C:\msys64\usr\lib\p7zip\7z.exe x "/c/windows/temp/gcc.7z"
+    bash -l -c "p7zip -d /c/windows/temp/gcc.7z" && \
+    bash -l -c "cp /mingw32/bin/gcc.exe /mingw32/bin/cc.exe"
 
 # ---- Move to new container, to drop messy build history
 ARG WIN_VERSION=ltsc2022