could be made static, but left as pattern based since the rules could be
combined with the other makefiles/there's no real need to treat building
the user using separate makefile rules, it's the same procedure for both
shared and user variant.
Change-Id: Ic1dbbcf4dfd8f533d215cc930cc455f95658db1b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/129725
Tested-by: Jenkins
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
3cc082dd61