Add support for freethreaded builds of Python 3.13 #2272

Job	Run time
pythonbuild	3m 41s
build (cpython-3.8, vcvars32.bat, pgo)	17m 3s
build (cpython-3.8, vcvars64.bat, pgo)	15m 58s
build (cpython-3.9, vcvars32.bat, pgo)	14m 45s
build (cpython-3.9, vcvars64.bat, pgo)	9m 20s
build (cpython-3.10, vcvars32.bat, pgo)	21m 1s
build (cpython-3.10, vcvars64.bat, pgo)	20m 23s
build (cpython-3.11, vcvars32.bat, pgo)	23m 20s
build (cpython-3.11, vcvars64.bat, pgo)	21m 33s
build (cpython-3.12, vcvars32.bat, pgo)	28m 4s
build (cpython-3.12, vcvars64.bat, pgo)	21m 55s
build (cpython-3.13, vcvars32.bat, pgo)	19m 23s
build (cpython-3.13, vcvars64.bat, pgo)	16m 7s
build (cpython-3.13, vcvars32.bat, freethreaded+pgo)	20m 6s
build (cpython-3.13, vcvars64.bat, freethreaded+pgo)	17m 18s
	4h 29m 57s

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