feat(gx): add incomplete 'CGxDeviceGLSDL' (#2)

* chore(build): add vendored SDL 3.0.0 library

* chore(build): add vendored glew-cmake-2.2.0 library

* feat(console): in the presence of -opengl launch flag, change GxApi to OpenGl

* feat(gx): add uncompleted CGxDeviceGLSDL targeting Windows and Linux

* chore(build): change SDL3 linkage from shared (bad) to to static (good)

vendor/sdl-3.0.0/.github/workflows/n3ds.yml

@@ -0,0 +1,65 @@
+name: Build (Nintendo 3DS)
+
+on: [push, pull_request]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  n3ds:
+    runs-on: ubuntu-latest
+    container:
+      image: devkitpro/devkitarm:latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install build requirements
+        run: |
+          apt update
+          apt install ninja-build
+      - name: Configure (CMake)
+        run: |
+          cmake -S . -B build -G Ninja \
+            -Wdeprecated -Wdev -Werror \
+            -DCMAKE_TOOLCHAIN_FILE=${DEVKITPRO}/cmake/3DS.cmake \
+            -DSDL_WERROR=ON \
+            -DSDL_TESTS=ON \
+            -DSDL_INSTALL_TESTS=ON \
+            -DSDL_VENDOR_INFO="Github Workflow" \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DCMAKE_INSTALL_PREFIX=prefix
+      - name: Build (CMake)
+        run: |
+          cmake --build build --verbose
+      - name: Install (CMake)
+        run: |
+          echo "SDL3_DIR=$(pwd)/prefix" >> $GITHUB_ENV
+          cmake --install build/
+          ( cd prefix; find ) | LC_ALL=C sort -u
+      - name: Package (CPack)
+        run: |
+          cmake --build build/ --config Release --target package
+      - name: Verify CMake configuration files
+        run: |
+          cmake -S cmake/test -B cmake_config_build -G Ninja \
+            -DCMAKE_TOOLCHAIN_FILE=${DEVKITPRO}/cmake/3DS.cmake \
+            -DTEST_SHARED=FALSE \
+            -DCMAKE_PREFIX_PATH=${{ env.SDL3_DIR }} \
+            -DCMAKE_BUILD_TYPE=Release
+          cmake --build cmake_config_build --verbose
+      - name: Extract CC/CXX/CFLAGS/CXXFLAGS from CMake toolchain
+        run: |
+          cmake -S .github/cmake -B /tmp/cmake_extract \
+            -DCMAKE_TOOLCHAIN_FILE=${DEVKITPRO}/cmake/3DS.cmake \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DVAR_PATH=/tmp/n3ds_env.txt
+          cat /tmp/n3ds_env.txt >> $GITHUB_ENV
+      - name: Verify sdl3.pc
+        run: |
+          export PKG_CONFIG_PATH=${{ env.SDL3_DIR }}/lib/pkgconfig
+          cmake/test/test_pkgconfig.sh
+      - uses: actions/upload-artifact@v3
+        with:
+          if-no-files-found: error
+          name: SDL-n3ds
+          path: build/dist/SDL3*