[issue45800] Move expat handling into configure and Makefile

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

An intermediate libexpat.a simplifies Modules/Setup.

The explicit rules are required to support BSD make. bmake does neither have "%.o: %.c" nor target variable overrides like GNU make.

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<https://bugs.python.org/issue45800>
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