Fix CBLAS prototype

Author: martin-frbg

interface/max.c

@@ -145,8 +145,13 @@ FLOATRET NAME(blasint *N, FLOAT *x, blasint *INCX){
 
 #else
 
+#ifdef COMPLEX
+FLOAT CNAME(blasint n, void *vx, blasint incx){
+  FLOAT *x = (FLOAT*) vx;
+#else
 FLOAT CNAME(blasint n, FLOAT *x, blasint incx){
-
+#endif
+  
   FLOAT ret;
 
   PRINT_DEBUG_CNAME;