Some compilers either only compile to an objc v1 or don't compile it at all, while it most likely wouldn't cause issues I added this just in case we stay on objc

Signed-off-by: Exverge <exverge@exverge.xyz>

initial metal backend

revert Upload files to "/"

It is very hard to explain why this public interface class was defined
in an anonymous namespace inside a header file.

When compiling with -DCMAKE_BUILD_TYPE=Debug, GCC would (correctly) fail to
compile intrinsics in stb and host1x due to lack of optimizations.

Sadly, the compilation error given is bogus and Clang completing the builds
without issues does raise some eyebrows.

Therefore, force optimizations for the offending files under GCC when
creating Debug builds.

Signed-off-by: voidanix <voidanix@keyedlimepie.org>

Cherry-picked from #65

revert Add img

Different image usage flags between image creation and image view
creation.