James McCoy a94e208db3 Use T_PYSSIZET for GraphicsManager.image_count
GraphicsManager.image_count is declared as a size_t, so the Python type
needs to be the same width.  On 64-bit big-endian architectures, this
mismatch was showing up as test failures:

    ======================================================================
    FAIL: test_gr_delete (kitty_tests.graphics.TestGraphics)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "/<<PKGBUILDDIR>>/kitty_tests/graphics.py", line 319, in test_gr_delete
        self.ae(len(layers(s)), 0), self.ae(s.grman.image_count, 1)
        ch = 20
        cw = 10
        delete = <function TestGraphics.test_gr_delete.<locals>.delete at 0x3ffb7fc38b0>
        dx = 0.2
        dy = 0.4
        layers = <function put_helpers.<locals>.layers at 0x3ffb77709d0>
        put_image = <function put_helpers.<locals>.put_image at 0x3ffb77708b0>
        put_ref = <function put_helpers.<locals>.put_ref at 0x3ffb7770940>
        rect_eq = <function put_helpers.<locals>.rect_eq at 0x3ffb7770a60>
        s = <fast_data_types.Screen object at 0x1b60df0>
        self = <kitty_tests.graphics.TestGraphics testMethod=test_gr_delete>
    AssertionError: 0 != 1
2020-04-25 23:25:18 -04:00
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