Fix SYSCALL_ALIAS for older MIPS assembler

Older MIPS assembler don't support .set for defining aliases.
Using = works for old and new assembers.
Signed-off-by: NThomas Bogendoerfer <tsbogend@alpha.franken.de>
Acked-by: NRalf Baechle <ralf@linux-mips.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/linux/syscalls.h

@@ -148,7 +148,7 @@ struct old_linux_dirent;
 	asm ("\t.globl " #alias "\n\t.set " #alias ", " #name "\n"	\
 	     "\t.globl ." #alias "\n\t.set ." #alias ", ." #name)
 #else
-#ifdef CONFIG_ALPHA
+#if defined(CONFIG_ALPHA) || defined(CONFIG_MIPS)
 #define SYSCALL_ALIAS(alias, name)					\
 	asm ( #alias " = " #name "\n\t.globl " #alias)
 #else