Use "https://cgit.freedesktop.org/libreoffice/core"
instead of "http://cgit.freedesktop.org/libreoffice/core"

Change-Id: Ic7248eeb2a9452da7236eeee08414a77714dd234
Signed-off-by: Gulsah Kose <gulsah.1004@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/52926Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>