CSC_LIB_FLAGS should be added when building

When building a C# file into a library the CSC_LIB_FLAG should be added.

Change-Id: Ib55a109efecfbff608977de444908910184af924
MBUS-1975 Breaking WINRT_UNITTEST into _RUN and _BUILD
ALLJOYN-2019 - Make the symbol file of AllJoyn.dll as part of debug build release for Win8/RT