Update webperimental to match current freeciv revision

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
Update freeciv server to r27035

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
Apply two freeciv server crash fixes

Backport RetireSafe (bug #22950) and AbortRecursiveBase (bug #22949)

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>