Only find kdepimlibs if building kpeople mode
Only find kdepimlibs if building kpeople mode

Reviewed-by: Martin Klapetek

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