sanitizer_common: fix SIG_DFL warning

[dvyukov]

Summary

Currently we have:

sanitizer_posix_libcdep.cpp:146:27: warning: cast between incompatible

function types from ‘__sighandler_t’ {aka ‘void (*)(int)’} to ‘sa_sigaction_t’
146 |     sigact.sa_sigaction = (sa_sigaction_t)SIG_DFL;

We don't set SA_SIGINFO, so we need to assign to sa_handler.
And SIG_DFL is meant for sa_handler, so this gets rid of both
compiler warning, type cast and potential runtime misbehavior.

compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp

 
 void Abort() {
 #if !SANITIZER_GO
   // If we are handling SIGABRT, unhandle it first.
   // TODO(vitalybuka): Check if handler belongs to sanitizer.
   if (GetHandleSignalMode(SIGABRT) != kHandleSignalNo) {
     struct sigaction sigact;
     internal_memset(&sigact, 0, sizeof(sigact));
-    sigact.sa_sigaction = (sa_sigaction_t)SIG_DFL;
+    sigact.sa_handler = SIG_DFL;
     internal_sigaction(SIGABRT, &sigact, nullptr);
   }
 #endif
 
   abort();
 }
 
 int Atexit(void (*function)(void)) {