kivy:Improve startup speed

gui/kivy/data/glsl/header.vs

@@ -0,0 +1,17 @@
+#ifdef GL_ES
+    precision highp float;
+#endif
+
+/* Outputs to the fragment shader */
+varying vec4 frag_color;
+varying vec2 tex_coord0;
+
+/* vertex attributes */
+attribute vec2     vPosition;
+attribute vec2     vTexCoords0;
+
+/* uniform variables */
+uniform mat4       modelview_mat;
+uniform mat4       projection_mat;
+uniform vec4       color;
+uniform float      opacity;