Allows dropping 4 API patches + the one that allows building against
system ICU.

Change-Id: Ib5c63ba7daf51b320c07b24486f7398bf71bcfbf
Reviewed-on: https://gerrit.libreoffice.org/57588
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>