i#6953: Fix sigcontext test AVX error #6954
Merged
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Replaces a kill() with an inlined system call in the linux.sigcontext test to avoid failure when compiled for AVX only, as the compiler inserts VZEROUPPER there (VZEROUPPER is recommended by Intel to avoid a performance penalty when switching between upper-zeroing VEX-encoded XMM operations and legacy upper-preserving SSE* operations: so doing it at transitions to code you don't control makes sense).
Tested on a toolchain targeting AVX.
Fixes #6953