Simplify RE_StretchRaw() with RE_UploadCinematic() and RB_InstantQuad2().

code/renderergl2/tr_extramath.h

@@ -42,6 +42,7 @@ void Matrix16View(vec3_t axes[3], vec3_t origin, matrix_t out);
 void Matrix16SimpleInverse( const matrix_t in, matrix_t out);
 
 #define VectorCopy2(a,b)		((b)[0]=(a)[0],(b)[1]=(a)[1])
+#define VectorSet2(v,x,y)       ((v)[0]=(x),(v)[1]=(y));
 
 #define VectorCopy4(a,b)		((b)[0]=(a)[0],(b)[1]=(a)[1],(b)[2]=(a)[2],(b)[3]=(a)[3])
 #define VectorSet4(v,x,y,z,w)	((v)[0]=(x),(v)[1]=(y),(v)[2]=(z),(v)[3]=(w))