Disable multithreading for trmv

as a (hopefully temporary) workaround for #1332

Author: martin-frbg

interface/trmv.c

@@ -220,6 +220,9 @@ void CNAME(enum CBLAS_ORDER order, enum CBLAS_UPLO Uplo,
 #ifdef SMP
   nthreads = num_cpu_avail(2);
 
+/*FIXME trmv_thread was found to be broken, see issue 1332 */
+  nthreads = 1;
+  
   if (nthreads == 1) {
 #endif