Change f32x3 to union

src/vec/vec.h

@@ -31,23 +31,21 @@ struct f32x2 {
   };
 };
 
-typedef struct f32x3 V3f;
-struct f32x3 {
-  union {
-    f32 elements[V3_ELEM_COUNT];
-    struct {
-      union {
-        f32 x;
-        f32 r;
-      };
-      union {
-        f32 y;
-        f32 g;
-      };
-      union {
-        f32 z;
-        f32 b;
-      };
+typedef union f32x3 V3f;
+union f32x3 {
+  f32 elements[V3_ELEM_COUNT];
+  struct {
+    union {
+      f32 x;
+      f32 r;
+    };
+    union {
+      f32 y;
+      f32 g;
+    };
+    union {
+      f32 z;
+      f32 b;
     };
   };
 };