Host_Error instead of Sys_Error when we try using q3bsp in sw.

git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@1487 fc73d0e0-1445-4013-8a0c-d673dee63da5

engine/common/gl_q2bsp.c

@@ -3641,7 +3641,7 @@ q2cmodel_t *CM_LoadMap (char *name, char *filein, qboolean clientload, unsigned
 
 			break;
 		default:
-			Sys_Error("Quake 3 maps are supported with dedicated servers and opengl only\n");
+			Host_EndGame("Cannot load q3bsps with the current renderer (only dedicated and opengl renderer)\n");
 		}
 		break;
 #endif