fdo#43157 : [API CHANGE] Remove OSL_THIS_FILE

Change-Id: Ifa6bdb2f2bdf96826f09c42a1e36d97ed6e034cd
Reviewed-on: https://gerrit.libreoffice.org/8886
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>