Add osx108 to pkg-jenkins

Add osx108 to pkg-jenkins. Also change amount of osx107 to 4 and
windows 7 x64 to 3.

Change-Id: I2edd5e9b86cc4fdcad4003fdd778040c838ad762
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>