Add include dir to be able to build with qt source package

This is from 5.3.1 qt source qtdeclarative/
Add private path to includes for desktop qmlc developer build to work
Merge pull request #4 from meltingsnowman/armthumb2_changes

Armthumb2 changes qt 5.3.1
Merge pull request #5 from meltingsnowman/developer_changes

Developer changes. qt 5.3.1
Merge branch 'qmlc-5.3.1' of https://github.com/qmlc/qtdeclarative into qmlc-5.3.1