Removed support for tkinter before Python 1.5.2

[radarhere]

Pillow/src/_imagingtk.c

Lines 26 to 28 in ad7be55

	/* copied from _tkinter.c (this isn't as bad as it may seem: for new
	versions, we use _tkinter's interpaddr hook instead, and all older
	versions use this structure layout) */

I saw "for new versions", and wondered how long this message has been there. It turns out, it has been there since the fork from PIL.

The code is used when ImageTk catches an AttributeError, which has also been present since the fork.

Pillow/src/PIL/ImageTk.py

Lines 71 to 85 in ad7be55

	try:
	if hasattr(tk, "interp"):
	# Required for PyPy, which always has CFFI installed
	from cffi import FFI
	ffi = FFI()
	# PyPy is using an FFI CDATA element
	# (Pdb) self.tk.interp
	# <cdata 'Tcl_Interp *' 0x3061b50>
	_imagingtk.tkinit(int(ffi.cast("uintptr_t", tk.interp)), 1)
	else:
	_imagingtk.tkinit(tk.interpaddr(), 1)
	except AttributeError:
	_imagingtk.tkinit(id(tk), 0)

interpaddr() added in Python 1.5.2. The last version of PIL supported Python 1.5.2, so it seems likely that the AttributeError catch was there for Python versions < 1.5.2.

We no longer support such early versions of Python, so this code can be removed.

[hugovk]

Wow! Here "new versions" means since April 1999, 23 years ago!

Here's where interpaddr() was committed to CPython on 29 Apr 1998:

• python/cpython@9d1b7ae

And added to the 1.5.2 NEWS file on 11 Aug 1998:

• python/cpython@ab9d6f0

And 1.5.2 was released on 13 April 1999:

• https://www.python.org/download/releases/1.5/

I think we can safely drop this without a deprecation warning :)