Staging: comedi: remove EXTERN macro since it is not used

Signed-off-by: Shawn Bohrer <shawn.bohrer@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/s626.h

@@ -76,14 +76,6 @@
 #define FALSE   (0)
 #endif
 
-#if !defined(EXTERN)
-#if defined(__cplusplus)
-#define EXTERN extern "C"
-#else
-#define EXTERN extern
-#endif
-#endif
-
 #if !defined(INLINE)
 #define INLINE static __inline
 #endif