I have ***NO*** idea why this makes a difference, but, without this
change, APPLE_CORE_FOUNDATION_LIBRARY is apparently *not* set correctly
for wsutil/CMakeLists.txt, and, with this change, it is. I guess
there's something magic involved here with "global" CMake variables or
something crazy such as that.
Change-Id: I7a0046b9c249568cd666720838104f48e854e203
Reviewed-on: https://code.wireshark.org/review/2612
Reviewed-by: Guy Harris <guy@alum.mit.edu>