Fix for building johntheripper with clang.

https://bugs.gentoo.org/show_bug.cgi?id=554392 

--- john-1.7.9-jumbo-7/src/rawSHA1_ng_fmt.c
+++ john-1.7.9-jumbo-7/src/rawSHA1_ng_fmt.c
@@ -530,7 +530,7 @@
 
 #if defined(__SSE4_1__)
 
-# if !defined(__INTEL_COMPILER)
+# if !defined(__INTEL_COMPILER) && !defined(__clang__)
 // This intrinsic is not always available in GCC, so define it here.
 static inline int _mm_testz_si128 (__m128i __M, __m128i __V)
 {
