MIPS: bug.h Build fix - include <linux/compiler.h>.

In the past this file somehow used to be dragged in.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/bug.h

 #ifndef __ASM_BUG_H
 #define __ASM_BUG_H
 
+#include <linux/compiler.h>
 #include <asm/sgidefs.h>
 
 #ifdef CONFIG_BUG