Implemented the X11 (non-OpenGL) renderer, no alpha or scaling available.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403271

configure.in

@@ -1172,6 +1172,13 @@ AC_HELP_STRING([--enable-video-x11-dpms], [enable X11 DPMS extension [[default=y
                     AC_DEFINE(SDL_VIDEO_DRIVER_X11_DPMS)
                 fi
             fi
+
+            AC_ARG_ENABLE(render-x11,
+AC_HELP_STRING([--enable-render-x11], [enable the X11 render driver [[default=yes]]]),
+                                , enable_render_x11=yes)
+            if test x$enable_render_x11 = xyes; then
+                AC_DEFINE(SDL_VIDEO_RENDER_X11)
+            fi
         fi
     fi
 }