Windows script to install golang tries to download a .exe file from
cache while the install file is really a .msi file.
Golang and upx are new packages to ci-files so let's define their
directory paths as neatly as possible to prevent more clutter to
ci-files.
This amends: 337206334e
Pick-to: 6.7
Change-Id: If6cfa38304bfec207500fcd7a67e3acba994eb9f
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>
(cherry picked from commit f6313247cc)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>