windows: fix build?

Shot in the dark.

TBR=r
CC=golang-dev
https://golang.org/cl/4126054

src/pkg/runtime/386/asm.s

@@ -5,6 +5,14 @@
 #include "386/asm.h"
 
 TEXT _rt0_386(SB),7,$0
+	// Linux, Windows start the FPU in extended double precision.
+	// Other operating systems use double precision.
+	// Change to double precision to match them,
+	// and to match other hardware that only has double.
+	PUSHL $0x27F
+	FLDCW	0(SP)
+	POPL AX
+
 	// copy arguments forward on an even stack
 	MOVL	0(SP), AX		// argc
 	LEAL	4(SP), BX		// argv

src/pkg/runtime/linux/386/rt0.s

@@ -5,13 +5,5 @@
 // Darwin and Linux use the same linkage to main
 
 TEXT _rt0_386_linux(SB),7,$0
-	// Linux starts the FPU in extended double precision.
-	// Other operating systems use double precision.
-	// Change to double precision to match them,
-	// and to match other hardware that only has double.
-	PUSHL $0x27F
-	FLDCW	0(SP)
-	POPL AX
-
 	JMP	_rt0_386(SB)