target-xtensa: add target stubs

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/elf.h b/elf.h
index ffcac7e..2e05d34 100644
--- a/elf.h
+++ b/elf.h
@@ -125,6 +125,8 @@
 #define EM_MICROBLAZE      189
 #define EM_MICROBLAZE_OLD  0xBAAB
 
+#define EM_XTENSA   94      /* Tensilica Xtensa */
+
 /* This is the info that is needed to parse the dynamic section of the file */
 #define DT_NULL		0
 #define DT_NEEDED	1