Add new dependency expat (required by exiv2)
Add exiv2 dependency source
Enable building of Exiv2 & its dependencies to configure.
Merge branch 'master' of code.mythtv.org:mythtv
Add condition for exiv2 include if using Microsoft Visual Studio
Merge branch 'master' of code.mythtv.org:mythtv
Make exiv2 incudepath part of settings.pro
Qt5 Fixes
Merge branch 'master' of code.mythtv.org:mythtv