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cpu: remove the old SSE register tests

Rémi Denis-Courmont requested to merge Courmisch/vlc:sse into master

Since CAN_COMPILE_SSE is no longer defined, this has been silently disabled. Besides:

  • This was always compiled out on Windows and OS/2.
  • This is no longer linked in on Linux since the more robust /proc/cpuinfo checks were introduced.
  • This is not used on MacOS at least since X86-32 support was dropped.

The point of this test was to verify that the OS scheduler supports the SSE register bank. According to the introduction commit 22 years ago (2788bc6a), the problem affected Linux 2.2.x, which is long since unsupported.

In the end, we still test the CPU feature support via CPUID. Remove this test only implicitly assumes that the OS kernel is not broken.

For what it is worth, this "fixes" the use of _exit() inside library code which was flagged by some linting tools.

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