Remove CIRCUITPY_8_9_WARNINGS and its usage.

[eightycc]

Removes CIRCUITPY_8_9_WARNINGS and its usage.

Resolves #9596. Because the CIRCUITPY_8_9_WARNINGS macro was defined to (0) this change is ready to merge now.

[tannewt]

I think we actually want to enable this (and rename to CIRCUITPY_9_10_WARNINGS.)

In 10 we intended to remove these APIs and we want to start warning about it in 9.

circuitpython/shared-bindings/displayio/__init__.c

Lines 103 to 115 in b2752b3

	// Remove these in CircuitPython 10
	#if CIRCUITPY_BUSDISPLAY
	{ MP_ROM_QSTR(MP_QSTR_Display), MP_ROM_PTR(&busdisplay_busdisplay_type) },
	#endif
	#if CIRCUITPY_EPAPERDISPLAY
	{ MP_ROM_QSTR(MP_QSTR_EPaperDisplay), MP_ROM_PTR(&epaperdisplay_epaperdisplay_type) },
	#endif
	#if CIRCUITPY_FOURWIRE
	{ MP_ROM_QSTR(MP_QSTR_FourWire), MP_ROM_PTR(&fourwire_fourwire_type) },
	#endif
	#if CIRCUITPY_I2CDISPLAYBUS
	{ MP_ROM_QSTR(MP_QSTR_I2CDisplay), MP_ROM_PTR(&i2cdisplaybus_i2cdisplaybus_type) },
	#endif

[tannewt]

These warnings were disabled because we added them too early. Following their advice broke compatibility with CP 8. Now that we're done with 8, we can enable it. Once main is CP 10 then we can remove the old APIs.

[eightycc]

Made changes requested by @tannewt: Renamed CIRCUITPY_8_9_WARNINGS to CIRCUITPY_9_10_WARNINGS and turned it on for CP 9. Will create an additional PR for CP10 that removes the warnings and the attribute aliases.

[dhalbert]

NB: In #9096, we disabled the warnings, because they were intrusive, and I aid we'd turn them back on when 8.x bundles were no longer being built.

[dhalbert]

Tested and works as expected, with warnings showing when old bindings are used. Thanks!

request satisfied