Tech ENABLE_GL_SHADERS_ATTRIBUTES - Added shaders for glsl version 140

(cherry picked from commit prusa3d/PrusaSlicer@76d1d4949b)

resources/shaders/110/background.vs

@@ -0,0 +1,12 @@
+#version 110
+
+attribute vec3 v_position;
+attribute vec2 v_tex_coord;
+
+varying vec2 tex_coord;
+
+void main()
+{
+	tex_coord = v_tex_coord;
+    gl_Position = vec4(v_position, 1.0);
+}