games/minecraft-client: Upgrade version 1.4.6 -> 1.7.5 and support stage
This poor PR is several months old. It applied without much trouble, but
several changes were made:
* Don't use https if http will do (and http works fine)
* Don't use the launcher URL. It is always the latest version, so the
second minecraft is updated, the port will break. Use an version-based
URL instead, one that will update with the port version
* Add stage support
* At least four stable versions have been released since the PR's version
of 1.6.2. Go ahead and update it to the latest stable version of 1.7.5
* The latest version builds and installs fine, but it was not tested.
Feedback on the PR indicates 1.6.2 works fine, but currently how well
version 1.7.5 works is unknown.
Submitted by: "r4721"
Approved by: maintainer (Janik Galasso)
Staged by: marino@