build: the last alterations allowing the UWP build to pass

MSVC/ring-daemon.vcxproj

MSVC/ring-daemon.vcxproj.filters

contrib/src/ffmpeg/fetch_and_patch.bat

src/call.h

src/dlfcn.c

src/logger.cpp

src/media/media_encoder.h

src/media/video/video_sender.h

src/ringdht/ringaccount.cpp

src/security/tls_session.h

src/security/tlsvalidator.cpp

src/sip/sdp.cpp

src/sip/sipaccount.cpp

src/sip/sipaccount.h

src/sip/siptransport.cpp

src/sip/sipvoiplink.cpp

src/upnp/upnp_context.cpp