fix bug in balsara, found by matthieu.

Former-commit-id: cee33042fcd80bedd4d1d7e7df9cd9c482fa392f

src/runner.c

@@ -431,7 +431,7 @@ void runner_doghost ( struct runner *r , struct cell *c ) {
                 p->force.POrho2 = u * ( const_gamma - 1.0f ) / ( rho + hg * rho_dh / 3.0f );
 
 		        /* Balsara switch */
-		        p->force.balsara = normCurl_v / ( normDiv_v + normCurl_v + 0.0001f * fc * ihg );
+		        p->force.balsara = normDiv_v / ( normDiv_v + normCurl_v + 0.0001f * fc * ihg );
                 
                 /* Reset the acceleration. */
                 for ( k = 0 ; k < 3 ; k++ )

src/vector.h

@@ -27,7 +27,7 @@
     #define VEC_MACRO(elcount, type)  __attribute__((vector_size((elcount)*sizeof(type)))) type
 
     /* So what will the vector size be? */
-    #ifdef __AVX__
+    #ifdef NO__AVX__
         #define VECTORIZE
         #define VEC_SIZE 8
         #define VEC_FLOAT __m256
@@ -54,7 +54,7 @@
         #define vec_dbl_ftoi(a) _mm256_cvttpd_epi32(a)
         #define vec_dbl_fmin(a,b) _mm256_min_pd(a,b)
         #define vec_dbl_fmax(a,b) _mm256_max_pd(a,b)
-    #elif defined( __SSE2__ )
+    #elif defined( NO__SSE2__ )
         #define VECTORIZE
         #define VEC_SIZE 4
         #define VEC_FLOAT __m128