Replace vec_load with vec_unaligned_load for GCC compiler.

src/hydro/Gadget2/hydro_iact.h

@@ -433,10 +433,10 @@ runner_iact_nonsym_intrinsic_vec_density(
   vector curlvrx, curlvry, curlvrz;
   
   /* Fill the vectors. */
-  mj.v = vec_load(Mj);
-  vjx.v = vec_load(Vjx);
-  vjy.v = vec_load(Vjy);
-  vjz.v = vec_load(Vjz);
+  mj.v = vec_unaligned_load(Mj);
+  vjx.v = vec_unaligned_load(Vjx);
+  vjy.v = vec_unaligned_load(Vjy);
+  vjz.v = vec_unaligned_load(Vjz);
 
   /* Get the radius and inverse radius. */
   ri = vec_reciprocal_sqrt(*r2);