wrapt: update to version 1.15.0 (#8826)

* Drop usage of gcc2, as no supported Python version uses it.
(but provide "non _x86" on 32 bits).
* Drop support for Python 3.8 (no in-tree usage, other than a
disabled recipe (will work on that later).
* Build with build/installer.
* All test pass OK for the supported Python versions.