A minor change to avoid a compiler error in clang

dlib/simd/simd8f.h

@@ -42,6 +42,8 @@ namespace dlib
         inline void load(const type* ptr)          { x = _mm256_loadu_ps(ptr); }
         inline void store(type* ptr)         const { _mm256_storeu_ps(ptr, x); }
 
+        inline simd8f& operator=(const simd8i& rhs) { *this = simd8f(rhs); return *this; }
+
         inline unsigned int size() const { return 8; }
         inline float operator[](unsigned int idx) const 
         {