Qt/Cpp: Add version headers
* lang/cpp/src/gpgmepp_version.h.in, lang/qt/src/qgpgme_version.h.in: New. Version information. * lang/qt/src/Makefile.am, lang/cpp/src/Makefile.am: Add them. * configure.ac: Configure them.
The version headers are common practice in KDE Frameworks and
were installed for KF5Gpgmepp and Libkleo respectively.