Add support for Cython 0.22

[DragonSA]

Building with cython 0.22 currently fails with:

cythoning kivy/graphics/texture.pyx to kivy/graphics/texture.c

   Error compiling Cython file:
   ------------------------------------------------------------
   ...
       cpdef release(self)
       cpdef get_pixel_color(self, int wx, int wy)

       cdef void create_fbo(self)
       cdef void delete_fbo(self)
       cdef void apply(self)
                     ^
   ------------------------------------------------------------

   kivy/graphics/fbo.pxd:25:19: Signature not compatible with previous declaration

   Error compiling Cython file:
   ------------------------------------------------------------
   ...
       cdef void push_states(self, list names) except *
       cdef void pop_state(self, str name) except *
       cdef void pop_states(self, list names) except *
       cdef void enter(self) except *
       cdef void leave(self) except *
       cdef void apply(self) except *
                     ^
   ------------------------------------------------------------

   kivy/graphics/instructions.pxd:118:19: Previous declaration is here
  building 'kivy.graphics.texture' extension
  creating build
  creating build/temp.freebsd-11.0-CURRENT-amd64-2.7
  creating build/temp.freebsd-11.0-CURRENT-amd64-2.7/kivy
  creating build/temp.freebsd-11.0-CURRENT-amd64-2.7/kivy/graphics
  cc -DNDEBUG -O2 -pipe -fstack-protector -fPIC -I/usr/local/include -I/usr/local/include/python2.7 -c kivy/graphics/texture.c -o build/temp.freebsd-11.0-CURRENT-amd64-2.7/kivy/graphics/texture.o
  kivy/graphics/texture.c:1:2: error: Do not use this file, it is the result of a
        failed Cython compilation.
  #error Do not use this file, it is the result of a failed Cython compilation.
   ^
  1 error generated.
   error: command 'cc' failed with exit status 1

[matham]

Closing because this is a dup of #2805.