bug423: Add dependencies to the libHalide.a libtool command line for the...

In the CMake/Xcode build, this change adds a link file list to the libtool command line for libHalide.a containing all of the static library dependencies required to fully link an application.  This allows an app to build with only libHalide.a without having to keep track of the version of the LLVM static libraries or other dependencies that were used to build it. 

Adding these static libraries to the cmake target via target_link_libraries(...) does not appear to work in the Xcode cmake generator so this change adds the files manually.