We need to copy the GDK .lib/.dll from Release_Broadway\<Platform>\bin
or Debug_Broadway\<Platform>\bin to Release\<Platform>\bin or
Debug\<Platform>\bin respectively during the build of Broadway flavors of
GDK, as the MSVC introspection builds expects the GDK .lib/.dll to be
in Release\<Platform>\bin or Debug\<Platform>\bin.
Use a new property sheet to do so for Broadway builds of GDK-during the
builds of Win32-only GDK, the broadway builds of the GDK .lib/.dll would
be cleared out prior to the build of the Win32-only GDK.
