Removed unused shaders

src/simple150.frag

@@ -1,14 +0,0 @@
-#version 150
-
-uniform sampler2D texture0;
-
-in vec2 fragTexCoord;
-in vec4 fragColor;
-
-out vec4 pixelColor;
-
-void main()
-{
-    // Output pixel color
-    pixelColor = texture(texture0, fragTexCoord) * fragColor;
-}

src/simple150.vert

@@ -1,21 +0,0 @@
-#version 150
-
-uniform mat4 projectionMatrix;
-uniform mat4 modelviewMatrix;
-
-in vec3 vertexPosition;
-in vec2 vertexTexCoord;
-in vec4 vertexColor;
-
-out vec2 fragTexCoord;
-out vec4 fragColor;
-
-void main()
-{
-    // Pass some variables to the fragment shader
-    fragTexCoord = vertexTexCoord;
-    fragColor = vertexColor;
-    
-    // Apply all matrix transformations to vertex
-    gl_Position = projectionMatrix * modelviewMatrix * vec4(vertexPosition, 1.0);
-}