CI: use GLES2 render target for linux ARM builds

Signed-off-by: falkTX <falktx@falktx.com>

.github/workflows/build.yml

@@ -114,7 +114,7 @@ jobs:
           source deps/PawPaw/local.env linux-${{ matrix.target }}
           export PKG_CONFIG_PATH+=:/usr/lib/${{ matrix.target }}-linux-gnu/pkgconfig
           make features
-          make HAVE_PULSEAUDIO=false NOOPT=true -j $(nproc)
+          make HAVE_PULSEAUDIO=false NOOPT=true USING_GLES2=${{ matrix.target == 'aarch64' || matrix.target == 'armhf' }} -j $(nproc)
           make unzipfx
       - name: Set sha8 (non-release)
         if: startsWith(github.ref, 'refs/tags/') != true