add #version 140 to GLSL shaders to fix running with newer OpenGL

shaders/obj.fp

@@ -1,3 +1,4 @@
+#version 140
 
 #ifdef GL_FRAGMENT_PRECISION_HIGH
 precision highp float;

shaders/obj.vp

@@ -1,3 +1,4 @@
+#version 140
 
 attribute vec3 pos;
 attribute vec3 normal;