fix type of restore_sigmask

SAVEDESTRUCTOR_X needs a function of type 'void (pTHX_ void *)' exactly.

Should fix this ASan error:

    scope.c:1543:13: runtime error: call to function restore_sigmask through pointer to incorrect function type 'void (*)(struct interpreter *, void *)'

Author: mauke

mg.c

@@ -1472,8 +1472,9 @@ Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
 
 #ifdef HAS_SIGPROCMASK
 static void
-restore_sigmask(pTHX_ SV *save_sv)
+restore_sigmask(pTHX_ void *ptr)
 {
+    SV *save_sv = (SV *)ptr;
     const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
     (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
 }