global cleanup to use the new syscall interface

src/misc/getpriority.c

@@ -3,7 +3,7 @@
 
 int getpriority(int which, id_t who)
 {
-	int ret = syscall2(__NR_getpriority, which, who);
+	int ret = syscall(SYS_getpriority, which, who);
 	if (ret < 0) return ret;
 	return 20-ret;
 }