x86/acpi: make "asmlinkage" part first thing in the function definition

g++ insists that function declaration must start with extern "C"
(which asmlinkage expands to).

gcc doesn't care.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/x86/kernel/acpi/sleep.c

@@ -43,7 +43,7 @@ unsigned long acpi_get_wakeup_address(void)
  *
  * Wrapper around acpi_enter_sleep_state() to be called by assmebly.
  */
-acpi_status asmlinkage __visible x86_acpi_enter_sleep_state(u8 state)
+asmlinkage acpi_status __visible x86_acpi_enter_sleep_state(u8 state)
 {
 	return acpi_enter_sleep_state(state);
 }

arch/x86/kernel/acpi/sleep.h

@@ -19,4 +19,4 @@ extern void do_suspend_lowlevel(void);
 
 extern int x86_acpi_suspend_lowlevel(void);
 
-acpi_status asmlinkage x86_acpi_enter_sleep_state(u8 state);
+asmlinkage acpi_status x86_acpi_enter_sleep_state(u8 state);