...as a consequence of a4e81b7c "No QuickTime in
the 10.12 SDK" and <https://gerrit.libreoffice.org/#/c/60375/> "Support for
building with macOS SDK < 10.12 is long gone"

Change-Id: Ida690370aea5b9559bb2c112dc73f26738facfd0
Reviewed-on: https://gerrit.libreoffice.org/60376
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>