Library loading - new platform hook for init_library_paths
Library loading - new platform hook for init_library_paths

* if a platform defines
   #define PARROT_PLATFORM_LIB_PATH_INIT_HOOK the_init_hook
  the function will be called with the LoL of search paths
* see perldoc src/library.c for the details
* more docs


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@10392 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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