x86-64/efibind: sanitize ms-abi cpp conditionals

Signed-off-by: David Decotigny <ddecotig@gmail.com>
Signed-off-by: Nigel Croxon <ncroxon@redhat.com>

inc/x86_64/efibind.h

@@ -25,8 +25,6 @@ Revision History
 #if defined(GNU_EFI_USE_MS_ABI)
     #if (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)))||(defined(__clang__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 2)))
         #define HAVE_USE_MS_ABI 1
-    #elif defined(__clang__)
-        #define HAVE_USE_MS_ABI 1
     #else
         #error Compiler is too old for GNU_EFI_USE_MS_ABI
     #endif