smartkey-hun: Create .inc file usable for Qt5 version

:Release Notes:
Split off the "meat" of the recipe into a .inc file for re-use when
creating a recipe for a Qt5 version of smartkey-hun.

:Detailed Notes:
- Having an .inc allows changing the Qt dependency and qmake inherit.
- Install Upstart 1.10 jobs in anticipation of switch to it.
- Drop cleaning of ${S}/SmartKeyQt4.pro; it's automatically recreated in
  do_configure.

:Testing Performed:
Only build tested and checked in buildhistory.

:QA Notes:

:Issues Addressed:
[GF-40650] Split off the "meat" of the recipe into a .inc file

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: I62fce2886832576c18bbc2f1617af03d7aee6c71
Reviewed-on: https://g2g.palm.com/3941
Reviewed-by: DCO Verification
Reviewed-by: Herb Kuta <herb.kuta@lge.com>
Tested-by: Herb Kuta <herb.kuta@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>