n3ds: fix exported libraries of n3ds

.github/workflows/n3ds.yml

@@ -38,5 +38,22 @@ jobs:
             -DCMAKE_PREFIX_PATH=${{ env.SDL2_DIR }} \
             -DCMAKE_BUILD_TYPE=Release
           cmake --build cmake_config_build --verbose
-      # Not running test_pkgconfig.sh and test_sdlconfig.sh
-      # as invoking the compiler manually is not supported
+      - name: Extract CC/CXX/CFLAGS/CXXFLAGS from CMake toolchain
+        run: |
+          cmake -S .github/cmake -B /tmp/cmake_extract \
+            -DCMAKE_TOOLCHAIN_FILE=${DEVKITPRO}/cmake/3DS.cmake \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DVAR_PATH=/tmp/n3ds_env.txt
+          cat /tmp/n3ds_env.txt >> $GITHUB_ENV
+      - name: Verify sdl2-config
+        run: |
+          export EXTRA_CFLAGS="$CFLAGS"
+          export EXTRA_LDFLAGS="$LDFLAGS"
+          export PATH=${{ env.SDL2_DIR }}/bin:$PATH
+          cmake/test/test_sdlconfig.sh
+      - name: Verify sdl2.pc
+        run: |
+          export EXTRA_CFLAGS="$CFLAGS"
+          export EXTRA_LDFLAGS="$LDFLAGS"
+          export PKG_CONFIG_PATH=${{ env.SDL2_DIR }}/lib/pkgconfig
+          cmake/test/test_pkgconfig.sh