Remove unneeded OS X provisioning scripts

Change-Id: Icf03c93adee31baac383d1394857df8c2df4fe59
Reviewed-by: Joni Jäntti <joni.jantti@qt.io>
Reviewed-by: Simo Fält <simo.falt@qt.io>

coin/provisioning/qtci-osx-10.8-x86_64/001-system_updates.sh

-#!/usr/bin/env bash
-
-BASEDIR=$(dirname "$0")
-$BASEDIR/../common/system_updates.sh

coin/provisioning/qtci-osx-10.8-x86_64/025-python3.sh

-source "${BASH_SOURCE%/*}/../common/python3.sh"

coin/provisioning/qtci-osx-10.9-x86_64/001-system_updates.sh

-#!/usr/bin/env bash
-
-BASEDIR=$(dirname "$0")
-$BASEDIR/../common/system_updates.sh

coin/provisioning/qtci-osx-10.9-x86_64/025-python3.sh

-source "${BASH_SOURCE%/*}/../common/python3.sh"

coin/provisioning/qtci-osx-10.9-x86_64/08-libclang.sh

-#!/usr/bin/env bash
-
-BASEDIR=$(dirname "$0")
-# There is only one mac package and common script uses it as a default
-$BASEDIR/../common/libclang.sh