m68k: fix getpagesize decoding

* linux/m68k/syscallent.h (getpagesize): Set sys_func.
* mem.c [M68K] (sys_getpagesize): Define.
diff --git a/mem.c b/mem.c
index ca6407f..8867f1e 100644
--- a/mem.c
+++ b/mem.c
@@ -277,7 +277,8 @@
 	return 0;
 }
 
-#if defined(ALPHA) || defined(IA64) || defined(SPARC) || defined(SPARC64)
+#if defined ALPHA || defined IA64 || defined M68K \
+ || defined SPARC || defined SPARC64
 SYS_FUNC(getpagesize)
 {
 	if (exiting(tcp))