[model] Move ANIM_CYCLE into model.h

Need it in the vulkan renderer to undo the scaling

include/QF/model.h

@@ -90,6 +90,7 @@ typedef struct instsurf_s {
 	float      *color;
 } instsurf_t;
 
+#define ANIM_CYCLE 2
 typedef struct texture_s {
 	char		name[16];
 	unsigned    width, height;

libs/models/brush/model_brush.c

@@ -362,7 +362,6 @@ Mod_LoadTextures (model_t *mod, bsp_t *bsp)
 				Sys_Error ("Bad animating texture %s", tx->name);
 		}
 
-#define	ANIM_CYCLE	2
 		// link them all together
 		for (int j = 0; j < max; j++) {
 			tx2 = anims[j];