[Opus] cmake - intinsics fixes, only compile SSE source with SSE flags on no…

[AntonioBL]

…n-windows when target use runtime check. For windows we only use /arch flag when target is presumed to support SSE to avoid AVX function pollution.

Cherry-picked from upstream opus xiph/opus@927de8453c50258

Signed-off-by: Jean-Marc Valin
Signed-off-by: AntonioBL

Resolves: issue 13666

See discussion in xiph/opus#154

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