Added support for getting the dependence of an executable on its libs,

Added support for getting the dependence of an executable on its libs,
using a variable to get the list of libraries on the link path.
BUG: If the library in the same directory as the executable is missing,
BUG: gnumake will build the library but then fail when linking the executable
BUG: saying the library was not found.  Need a better hack.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225 91177308-0d34-0410-b5e6-96231b3b80d8