accomidate big-endian emulation

Reference: /n/atom/patch/applied2013/fpibigend
Date: Wed Jul 31 21:04:00 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/port/fpi.c	Wed Jul 31 21:03:51 2013
+++ /sys/src/9/port/fpi.c	Wed Jul 31 21:03:51 2013
@@ -5,6 +5,7 @@
  * NB: the Internal arguments to fpisub and fpidiv are reversed from
  * what you might naively expect: they compute y-x and y/x, respectively.
  */
+#include <u.h>
 #include "../port/fpi.h"
 
 void
--- /sys/src/9/port/fpi.h	Wed Jul 31 21:03:52 2013
+++ /sys/src/9/port/fpi.h	Wed Jul 31 21:03:52 2013
@@ -1,10 +1,11 @@
 typedef long Word;
 typedef long long Vlong;
 typedef unsigned long Single;
-typedef struct {
-	unsigned long l;
-	unsigned long h;
-} Double;
+
+/* use u.h's FPdbleword */
+#define Double	FPdbleword
+#define h hi
+#define l lo
 
 enum {
 	FractBits	= 28,
--- /sys/src/9/port/fpimem.c	Wed Jul 31 21:03:53 2013
+++ /sys/src/9/port/fpimem.c	Wed Jul 31 21:03:53 2013
@@ -1,3 +1,4 @@
+#include <u.h>
 #include "../port/fpi.h"
 
 /*