build: explicitly link against swiftDispatch

swift-corelibs-foundation is an implementation of the Foundation APIs in
swift.  It has a dependency on libdispatch and uses some of the swift
interfaces.  Ensure that we enumerate the dependency for linking
purposes.  This was noticed as missing when building for Windows.

Author: compnerd

CMakeLists.txt

@@ -91,7 +91,7 @@ set(libdispatch_ldflags)
 if(FOUNDATION_ENABLE_LIBDISPATCH)
   set(deployment_enable_libdispatch -DDEPLOYMENT_ENABLE_LIBDISPATCH)
   set(libdispatch_cflags -I;${FOUNDATION_PATH_TO_LIBDISPATCH_SOURCE};-I;${FOUNDATION_PATH_TO_LIBDISPATCH_BUILD}/src/swift;-Xcc;-fblocks)
-  set(libdispatch_ldflags -L;${FOUNDATION_PATH_TO_LIBDISPATCH_BUILD};-L;${FOUNDATION_PATH_TO_LIBDISPATCH_BUILD}/src;-ldispatch)
+  set(libdispatch_ldflags -L;${FOUNDATION_PATH_TO_LIBDISPATCH_BUILD};-L;${FOUNDATION_PATH_TO_LIBDISPATCH_BUILD}/src;-ldispatch;-lswiftDispatch)
   if(CMAKE_SYSTEM_NAME STREQUAL Linux OR CMAKE_SYSTEM_NAME STREQUAL Android OR CMAKE_SYSTEM_NAME STREQUAL FreeBSD)
     list(APPEND libdispatch_ldflags -Xlinker;-rpath;-Xlinker;${FOUNDATION_PATH_TO_LIBDISPATCH_BUILD}/src)
   endif()