[sanitizer] Remove unneeded forward declaration of real_sigaction

llvm-svn: 317869

compiler-rt/lib/asan/asan_interceptors.h

@@ -105,10 +105,6 @@ DECLARE_REAL(SIZE_T, strlen, const char *s)
 DECLARE_REAL(char*, strncpy, char *to, const char *from, uptr size)
 DECLARE_REAL(uptr, strnlen, const char *s, uptr maxlen)
 DECLARE_REAL(char*, strstr, const char *s1, const char *s2)
-struct sigaction;
-DECLARE_REAL(int, sigaction, int signum,
-             const __sanitizer::__sanitizer_sigaction *act,
-             __sanitizer::__sanitizer_sigaction *oldact)
 
 #if !SANITIZER_MAC
 #define ASAN_INTERCEPT_FUNC(name)                                        \