added glm_vec_fill() (#100)

* alternative name for _broadcast(): _fill()

src/vec3.c

@@ -310,6 +310,12 @@ glmc_vec3_broadcast(float val, vec3 d) {
   glm_vec3_broadcast(val, d);
 }
 
+CGLM_EXPORT
+void
+glmc_vec3_fill(vec3 v, float val) {
+  glm_vec3_fill(v, val);
+}
+
 CGLM_EXPORT
 bool
 glmc_vec3_eq(vec3 v, float val) {