Support disabling C extensions via IMMUTABLES_EXT=0
#117
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Support using
IMMUTABLES_EXT
environment variable to control whether the C extension is built explicitly. When set to a value other than 1, the extension built is disabled. This is helpful e.g. for future Python versions where the extension does not work (this is affecting 3.13 right now, but having an explicit option is more future-proof).