Add tip to scroll up on package build failure.

[nh2]

Many users don't get that when they see an error like

[tons of output]
--  While building package hopenssl-2.2.4 using:
[one bit line more output]

they have to scroll up (potentially multiple terminal pages!) to the last output starting with e.g. hopenssl >.

This adds an explicit call to scroll up to that section, so that this user confusion can be reduced.

• Any changes that could be relevant to users have been recorded in the ChangeLog.md
• The documentation has been updated, if necessary.

Please also shortly describe how you tested your change. Bonus points for added tests!

I haven't tested this at all because it's just a simple string change I made on a whim and hopw CI will do it for me :)