add missing KPeople include directories to CMakeLists.txt
add missing KPeople include directories to CMakeLists.txt

leonhandreke/ktp-common-internals,leonhandreke/ktp-common-internals,KDE/ktp-common-internals,leonhandreke/ktp-common-internals,KDE/ktp-common-internals,KDE/ktp-common-internals