[sanitizer] Include signal.h instead of sys/signal.h
#include <link.h>
#include <pthread.h>
#include <sched.h>
+#include <signal.h>
#include <sys/mman.h>
#if !SANITIZER_SOLARIS
#include <sys/ptrace.h>
#include <ucontext.h>
#endif
#if SANITIZER_OPENBSD
-#include <signal.h>
#include <sys/futex.h>
#endif
#include <unistd.h>
@@ -104,10 +104,6 @@ extern struct ps_strings *__ps_strings;
#define environ _environ
#endif
-#if !SANITIZER_ANDROID
-#include <sys/signal.h>
-#endif
-
extern char **environ;
#if SANITIZER_LINUX
