add SS_AUTODISARM sigaltstack ss_flags from linux v4.7 to signal.h
only matters if swapcontext is used in a signal handler running on an altstack, new in linux commit 2a74213838104a41588d86fd5e8d344972891ace
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only matters if swapcontext is used in a signal handler running on an altstack, new in linux commit 2a74213838104a41588d86fd5e8d344972891ace