qt, cpp: Add cmake config files for w32
* lang/cpp/src/GpgmeppConfig-w32.cmake.in.in lang/qt/src/QGpgmeConfig-w32.cmake.in.in: New. * lang/cpp/src/GpgmeppConfig.cmake.in.in, lang/qt/src/QGpgmeConfig.cmake.in.in: Remove libsuffix handling. * lang/cpp/src/Makefile.am, lang/qt/src/Makefile.am: Create / install w32 config files. * configure.ac: Configure them.
To work with DLL's cmake needs to know about the implib and
the final DLL. So the config files look different enough
that it's better to use alternative files.