quake: merge some fixed-point optimizations from PocketQuake

The PocketQuake project, available below, has some nice fixed-point code:

https://web.archive.org/web/20150412233306/http://quake.pocketmatrix.com/PocketQuake0062_src.zip

I'd like to see most of them merged into our Quake port. This commit
gives +0.9FPS on ipod6g. (A big change given that it was running at
only 9.7FPS to begin with!)

Change-Id: I91931bdd5c22f14fb28616de938a03b4e7d7b076

apps/plugins/sdl/progs/quake/model.h

@@ -49,6 +49,16 @@ typedef struct
 	vec3_t		position;
 } mvertex_t;
 
+typedef struct
+{
+	int		position[3];
+} mvertex_fxp_t;
+
+typedef struct
+{
+	vec3_FPM_t		position;
+} mvertex_FPM_t;
+
 #define	SIDE_FRONT	0
 #define	SIDE_BACK	1
 #define	SIDE_ON		2
@@ -331,6 +341,10 @@ typedef struct model_s
 
 	int			numvertexes;
 	mvertex_t	*vertexes;
+    
+#ifdef USE_PQ_OPT2
+	mvertex_fxp_t	*vertexes_fxp;
+#endif
 
 	int			numedges;
 	medge_t		*edges;