SSE Support breaks build on non x86 platforms.

[StanleySweet]

At least on macos this is not supported:

-march=knl

https://github.com/GPUOpen-Tools/compressonator/blob/master/build/sdk/cmp_core/CMakeLists.txt#L143
https://github.com/GPUOpen-Tools/compressonator/blob/master/cmp_core/CMakeLists.txt#L101

Likely introduced by e9b1b99