support for non-power-of-two textures

[Nobody/Anonymous]

step 1:

under ILboolean HasCubemapHardware = IL_FALSE;
add:
         ILboolean HasNonPowerOfTwoHardware = IL_FALSE;

step 2:
under
    if (IsExtensionSupported("GL_ARB_texture_cube_map"))
        HasCubemapHardware = IL_TRUE;
add:
    if (IsExtensionSupported("GL_ARB_texture_non_power_of_two"))
        HasNonPowerOfTwoHardware = IL_TRUE;

step 3:
in MakeGLCompliant
surround the image resize block with:

    if (HasNonPowerOfTwoHardware == IL_FALSE)
    {
        if (Src->Width  != ilNextPower2(Src->Width)  ||
            Src->Height != ilNextPower2(Src->Height) ||
......
        }

[Anonymous]

It is a bit more complicated due to the text with the maximum size of a texture. fixed.