matplotlib's setup.py by default adds an -flto flag to CFLAGS. This can cause errors in the linking stage if we mix two compiler versions, as observed in #27754.

We disable it.

CC: @orlitzky @antonio-rojas @dimpase @jhpalmieri @kiwifb

Component: packages: standard

Author: Matthias Koeppe

Branch/Commit: 2d16e5d

Reviewer: François Bissey

Issue created by migration from https://trac.sagemath.org/ticket/30365