consistency: change all remaining syscalls to use SYS_ rather than __NR_ prefix
diff --git a/src/ipc/msgrcv.c b/src/ipc/msgrcv.c
index ee07176..13c282e 100644
--- a/src/ipc/msgrcv.c
+++ b/src/ipc/msgrcv.c
@@ -7,7 +7,7 @@
 {
 	ssize_t r;
 	CANCELPT_BEGIN;
-#ifdef __NR_msgrcv
+#ifdef SYS_msgrcv
 	r = syscall(SYS_msgrcv, q, m, len, type, flag);
 #else
 	r = syscall(SYS_ipc, IPCOP_msgrcv, q, len, flag, ((long[]){ (long)m, type }));