changes to librw layer, GLES now runtime choice

src/extras/shaders/simple.frag

@@ -1,16 +1,17 @@
 uniform sampler2D tex0;
 
-in vec4 v_color;
-in vec2 v_tex0;
-in float v_fog;
-
-out vec4 color;
+FSIN vec4 v_color;
+FSIN vec2 v_tex0;
+FSIN float v_fog;
 
 void
 main(void)
 {
+	vec4 color;
 	color = v_color*texture(tex0, vec2(v_tex0.x, 1.0-v_tex0.y));
 	color.rgb = mix(u_fogColor.rgb, color.rgb, v_fog);
 	DoAlphaTest(color.a);
+
+	FRAGCOLOR(color);
 }