[Cairo] New functions for cairo_matrix

[Carl Worth]

On Nov 14, Duncan Mak wrote:
 > >From MSDN:
 > 
 > The Equals method determines whether the elements of this matrix are
 > equal to the elements of another matrix.

OK. I don't see much utility in adding this function to cairo.

Can you get by with just using cairo_matrix_get_affine ?

-Carl