Enable GCC warning flag -Wnested-externs, fix warnings

Move nested extern declarations into header files, or use the
already existing declarations.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@861 f158a5a8-5612-0410-a976-696ce0be7e32

arch/x86/context.c

@@ -12,6 +12,7 @@
 #include "context.h"
 #include "libopenbios/sys_info.h"
 #include "boot.h"
+#include "openbios.h"
 
 #define MAIN_STACK_SIZE 16384
 #define IMAGE_STACK_SIZE 4096
@@ -57,8 +58,6 @@ unsigned long __boot_ctx;
 static void start_main(void)
 {
     int retval;
-    extern int openbios(void);
-    extern void init_exceptions(void);
 
     /* Save startup context, so we can refer to it later.
      * We have to keep it in physical address since we will relocate. */

arch/x86/openbios.c

@@ -50,8 +50,6 @@ static void init_memory(void)
 static void
 arch_init( void )
 {
-	void setup_timers(void);
-
 	openbios_init();
 	modules_init();
 #ifdef CONFIG_DRIVER_PCI

arch/x86/openbios.h

@@ -19,6 +19,9 @@
 
 int openbios(void);
 
+/* entry.S */
+void init_exceptions(void);
+
 /* console.c */
 extern void	cls(void);
 #ifdef CONFIG_DEBUG_CONSOLE