[MIPS] DEC: Remove redeclarations of mips_machgroup and mips_machtype.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/dec/prom/identify.c b/arch/mips/dec/prom/identify.c
index c4e3c1e..cd85924 100644
--- a/arch/mips/dec/prom/identify.c
+++ b/arch/mips/dec/prom/identify.c
@@ -26,9 +26,6 @@
 
 #include "dectypes.h"
 
-extern unsigned long mips_machgroup;
-extern unsigned long mips_machtype;
-
 static const char *dec_system_strings[] = {
 	[MACH_DSUNKNOWN]	"unknown DECstation",
 	[MACH_DS23100]		"DECstation 2100/3100",