GRAPHICS: AGS: Fix ODR problems in AGS and add Clang support #6090
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This PR fixes leftovers following the PR #5581 where AGS code was not touched to apply the same recipe.
Then, the support for Clang is added with proper version checks.
Finally the checks for GCC and Clang version are relaxed for architecture which do not need such checks (ARMv8 for NEON and x86_64 for SSE2).
This is not perfect as old Android ARM cannot benefit from the SIMD code but it allows to widen the support to Android ARM64 and all MacOS platforms at least.