build_wrapper: Create Qt Creator's latest links in the right place

Otherwise, the subdirectories get the BUILD_NUMBER from the source
packages, which makes it hard to follow from what Jenkins build
they can from.

Also, fixing the TIMESTAMP directory name while we are it.

Change-Id: I3031da84683017969c7bf585297e8c9837386dfe
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>
Fix typo in build script

Change-Id: Iedddc194662ff71d4f873458ba2127cbcd61123a
Reviewed-by: Matti Paaso <matti.paaso@digia.com>
Fix unlock_keychain() in build_wrapper.py

Change-Id: I6258e75faa77179d2ba46698f86c5e279eecde9c
Reviewed-by: Matti Paaso <matti.paaso@digia.com>
build_wrapper: Remove hardcoded paths to 'curl.exe'

Let's use the %CURL% env variable on Windows instead. This env variable
will be set up in Jenkins.

Change-Id: I6106097ea9712c1d550ef97245b41591e738247c
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>
build_wrapper: Remove hardcoded paths to 'rm' command

Let's use the %RM% env variable on Windows instead. This env variable
will be set up in Jenkins.

Change-Id: I4590f59626dd87533cd431dce7c53a3456a7def4
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>