Add IS_CE to constants

[yunline]

Issue: #1845

[oddbookworm]

In my testing, this worked great. getattr(pygame, "IS_CE", False) returned True. I think docs should be added for this feature however, which is the reason for the change request. Probably best to document it in https://github.com/pygame-community/pygame-ce/blob/main/docs/reST/ref/pygame.rst IMO

[MyreMylar]

This also seems to be crashing the CI in the sphinx docs.

Perhaps we could just do a:

DEC_CONSTS(IS_CE, 1);

instead?

[yunline]

This also seems to be crashing the CI in the sphinx docs.

Perhaps we could just do a:

DEC_CONSTS(IS_CE, 1);

instead?

I doubt if the crash was caused by IS_CE.
And IS_CE should be a bool but DEC_CONSTS genetates an integer constant.
Well, You are right.

[MyreMylar]

Tested with:

import pygame


if getattr(pygame, "IS_CE", False):
    print("Running pygame CE")
else:
    print("Not running pygame CE")

And it works as it should.

[oddbookworm]

LGTM!