python: fix sitecustomize.py

Fixes #26377.
Fixes #28001.
python3: bring sitecustomize in sync with python2
mariadb 10.0.10

Closes #28005.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
haxe 3.1.2
haxe: replace absolute symlink with relative one
haxe: update 3.1.2 bottle.