Use "pkcs12" feature string instead of the old "pix" label.
Use "pkcs12" feature string instead of the old "pix" label.

Also check that PKCS12 support is available before trying
to use it in the constructor that takes a filename.

svn path=/trunk/kdesupport/qca/; revision=597049

Bjoe/qca,oktavarium/qca,JoshuaKolden/qca,oktavarium/qca,JoshuaKolden/qca,karolherbst/qca,KDE/qca,oktavarium/qca,JoshuaKolden/qca,sladage/qca,Esf-Software/qca,Bjoe/qca,KDE/qca,highfidelity/qca,Bjoe/qca,KDE/qca,Esf-Software/qca,karolherbst/qca,Esf-Software/qca,highfidelity/qca,Esf-Software/qca,karolherbst/qca,karolherbst/qca,sladage/qca,JoshuaKolden/qca,oktavarium/qca,highfidelity/qca,KDE/qca,Bjoe/qca,sladage/qca,sladage/qca,highfidelity/qca