[qtc] disable updateinfo plugin

Random crashes seem to be caused by the obsolete updateinfo
plugin.

https://bugreports.qt-project.org/browse/QTCREATORBUG-11262

This also disables the "updates available" pop up, which makes
noticing SDK updates more difficult.

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
Merge pull request #23 from sailfish-sdk/disable-updateinfo

[qtc] disable updateinfo plugin
Merge pull request #24 from martyone/next

Fix crashes caused by UpdateInfo and more
Revert "Merge pull request #23 from sailfish-sdk/disable-updateinfo"

This reverts commit 0d88a67095b4e26aa419ca515608deacbaa91874, reversing
changes made to aca350ff15992eec91e9fd72ea51a42060e43a4c.
Mer: Hide emulator button when not needed for current target

Signed-off-by: Martin Kampas <martin.kampas@jolla.com>