Xcode: Teach Tests/BuildDepends to allow LINK_DEPENDS_NO_SHARED failure

Xcode 5.0 now relinks targets when their shared libraries dependencies
are modified, and there seems to be no way to stop it.  Report this as a
known limitation in the test output and do not fail.

Tests/BuildDepends/CMakeLists.txt

@@ -285,6 +285,8 @@ if(EXISTS "${link_depends_no_shared_check_txt}")
   file(STRINGS "${link_depends_no_shared_check_txt}" link_depends_no_shared_check LIMIT_COUNT 1)
   if("${link_depends_no_shared_check}" STREQUAL "0")
     message(STATUS "link_depends_no_shared_exe is older than link_depends_no_shared_lib as expected.")
+  elseif(XCODE AND NOT XCODE_VERSION VERSION_LESS 5)
+    message(STATUS "Known limitation: link_depends_no_shared_exe is newer than link_depends_no_shared_lib but we cannot stop Xcode ${XCODE_VERSION} from enforcing this dependency.")
   else()
     message(SEND_ERROR "Project did not rebuild properly: link_depends_no_shared_exe is newer than link_depends_no_shared_lib.")
   endif()