[packagekit] QPackageKit headers have moved

[Adrien BUSTANY]

Hi there QPackageKit users (yeah, I know, that's only two people...)
Following a discussion with Richard, I changed the path where the 
headers are installed : it's now $(INCLUDE_PATH)/PackageKit/packagekit-qt

Here's the diff:

diff --git a/lib/packagekit-qt/src/CMakeLists.txt 
b/lib/packagekit-qt/src/CMakeLists.txt
index 635c58c..373e208 100644
--- a/lib/packagekit-qt/src/CMakeLists.txt
+++ b/lib/packagekit-qt/src/CMakeLists.txt
@@ -58,5 +58,5 @@ install(FILES
        package.h
        QPackageKit
        DESTINATION
-       include/packagekit-qt)
+       include/PackageKit/packagekit-qt)

Cheers

Adrien