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MINOR: [Python][CI] Avoid unconditional use of precompiled headers (#44288)

The precompiled headers generated during the PyArrow build phase seem to take a lot of disk space (more than 2 GB).

Avoiding their unconditional generation should make disk space issues on CI less likely.

Here is an example failing build due to exhausted disk space: https://github.com/apache/arrow/actions/runs/11128048506/job/30921855648?pr=44250

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>