Move DECLARE_GLOBAL_DATA_PTR to file scope

It can be optimised out by the compiler otherwise resulting
in obscure errors like a board not booting.

This has been documented in README since 2006 when these were
first fixed up for GCC 4.x.

Signed-off-by: John Rigby <john.rigby@linaro.org>

Fix some additional places.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-By: Albert ARIBAUD <albert.aribaud@free.fr>
diff --git a/board/isee/igep0020/igep0020.c b/board/isee/igep0020/igep0020.c
index 3ba541e..36cc924 100644
--- a/board/isee/igep0020/igep0020.c
+++ b/board/isee/igep0020/igep0020.c
@@ -32,6 +32,8 @@
 #include <asm/mach-types.h>
 #include "igep0020.h"
 
+DECLARE_GLOBAL_DATA_PTR;
+
 /* GPMC definitions for LAN9221 chips */
 static const u32 gpmc_lan_config[] = {
     NET_LAN9221_GPMC_CONFIG1,
@@ -48,8 +50,6 @@
  */
 int board_init(void)
 {
-	DECLARE_GLOBAL_DATA_PTR;
-
 	gpmc_init(); /* in SRAM or SDRAM, finish GPMC */
 	/* board id for Linux */
 	gd->bd->bi_arch_number = MACH_TYPE_IGEP0020;