Change the SDK back to 31

Check if it's actually a regression or just Turnip freaking out with low SDK level

turnip_builder.sh

@@ -60,8 +60,8 @@ ndk="$workdir/$ndkver/toolchains/llvm/prebuilt/linux-x86_64/bin"
 cat <<EOF >"android-aarch64"
 [binaries]
 ar = '$ndk/llvm-ar'
-c = ['ccache', '$ndk/aarch64-linux-android29-clang']
-cpp = ['ccache', '$ndk/aarch64-linux-android29-clang++', '-fno-exceptions', '-fno-unwind-tables', '-fno-asynchronous-unwind-tables', '-static-libstdc++']
+c = ['ccache', '$ndk/aarch64-linux-android31-clang']
+cpp = ['ccache', '$ndk/aarch64-linux-android31-clang++', '-fno-exceptions', '-fno-unwind-tables', '-fno-asynchronous-unwind-tables', '-static-libstdc++']
 c_ld = 'lld'
 cpp_ld = 'lld'
 strip = '$ndk/aarch64-linux-android-strip'
@@ -76,7 +76,7 @@ EOF
 
 
 echo "Generating build files ..." $'\n'
-meson build-android-aarch64 --cross-file "$workdir"/mesa-main/android-aarch64 -Dbuildtype=release -Dplatforms=android -Dplatform-sdk-version=29 -Dandroid-stub=true -Dgallium-drivers= -Dvulkan-drivers=freedreno -Dfreedreno-kmds=kgsl -Db_lto=true &> "$workdir"/meson_log
+meson build-android-aarch64 --cross-file "$workdir"/mesa-main/android-aarch64 -Dbuildtype=release -Dplatforms=android -Dplatform-sdk-version=31 -Dandroid-stub=true -Dgallium-drivers= -Dvulkan-drivers=freedreno -Dfreedreno-kmds=kgsl -Db_lto=true &> "$workdir"/meson_log