CI, Win32: Add x64 (64bit) binaries for Windows

By popular demand the CI now builds 64bit binaries for Windows.
This allows SolveSpace to open large models (by accessing >4GB RAM).

Fixes solvespace#1261

Author: ruevs

.github/scripts/build-windows.sh

@@ -9,13 +9,20 @@ if [ "$1" = "release" ]; then
     else
         ENABLE_OPENMP="OFF"
     fi
+
+    if [ "$3" = "x64" ]; then
+        PLATFORM="$3"
+    else
+        PLATFORM="Win32"
+    fi
+
     BUILD_TYPE=RelWithDebInfo
     cmake \
         -G "Visual Studio 17 2022" \
         -DCMAKE_BUILD_TYPE="${BUILD_TYPE}" \
         -DENABLE_OPENMP="${ENABLE_OPENMP}" \
         -DENABLE_LTO=ON \
-        -DCMAKE_GENERATOR_PLATFORM="Win32" \
+        -DCMAKE_GENERATOR_PLATFORM="${PLATFORM}" \
         ..
 else
     BUILD_TYPE=Debug
@@ -31,6 +38,14 @@ cmake --build . --config "${BUILD_TYPE}" -- -maxcpucount
 
 bin/$BUILD_TYPE/solvespace-testsuite.exe
 
-if [ "$2" = "openmp" ]; then
-    mv bin/$BUILD_TYPE/solvespace.exe bin/$BUILD_TYPE/solvespace-openmp.exe
+if [ "$3" = "x64" ]; then
+	if [ "$2" != "openmp" ]; then
+		mv bin/$BUILD_TYPE/solvespace.exe bin/$BUILD_TYPE/solvespace_single_core_x64.exe
+	else
+		mv bin/$BUILD_TYPE/solvespace.exe bin/$BUILD_TYPE/solvespace_x64.exe
+	fi
+else
+	if [ "$2" != "openmp" ]; then
+		mv bin/$BUILD_TYPE/solvespace.exe bin/$BUILD_TYPE/solvespace_single_core.exe
+	fi
 fi

.github/workflows/cd.yml

@@ -70,7 +70,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: windows
-          path: build/bin/RelWithDebInfo/solvespace.exe
+          path: build/bin/RelWithDebInfo/solvespace_single_core.exe
 
   build_release_windows_openmp:
     needs: [test_ubuntu, test_windows, test_macos]
@@ -88,7 +88,43 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: windows-openmp
-          path: build/bin/RelWithDebInfo/solvespace-openmp.exe
+          path: build/bin/RelWithDebInfo/solvespace.exe
+
+  build_release_windows_x64:
+    needs: [test_ubuntu, test_windows, test_macos]
+    name: Build Release Windows x64
+    runs-on: windows-2022
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Dependencies
+        run: .github/scripts/install-windows.sh
+        shell: bash
+      - name: Build & Test
+        run: .github/scripts/build-windows.sh release not_openmp x64
+        shell: bash
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: windows
+          path: build/bin/RelWithDebInfo/solvespace_single_core_x64.exe
+
+  build_release_windows_openmp_x64:
+    needs: [test_ubuntu, test_windows, test_macos]
+    name: Build Release Windows (OpenMP) x64
+    runs-on: windows-2022
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Dependencies
+        run: .github/scripts/install-windows.sh
+        shell: bash
+      - name: Build & Test
+        run: .github/scripts/build-windows.sh release openmp x64
+        shell: bash
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: windows-openmp
+          path: build/bin/RelWithDebInfo/solvespace_x64.exe
 
   build_release_macos:
     needs: [test_ubuntu, test_windows, test_macos]