switch rpm suggestion feature to a Python extension
    
    This commit backports several patches from upstream GDB:
    
      7d21600b31f
      dd5516bf98f
      e8c3dafa5f5
      1146d27749f
      7db795bc67a
      8f6c452b5a4
      661d98a3331
      6234ba17598
      27807da5849
      7628a997f27
    
    These commits provide a new Python API which allows users to catch the
    case where GDB tries to load an objfile, but can't find any debug
    information.
    
    I've then added a new patch which uses this Python API to hook into
    GDB and make suggestions about RPMs to install that could provide
    missing debug information, this should replace some of the rpm
    suggestion functionality that is currently implemented within GDB's
    C++ code, as such I've deleted all of the code related to opening
    librpm and querying the RPM database.
    
    There is still code in GDB which will make suggestions about
    installing RPMs based on the path to the build-id symlink for the
    file.  This code is hit when a user tries to open a core-file and the
    corresponding executable can't be found, or if a shared library
    required by the core-file isn't found.
    
    In these cases the librpm lookup would always fail anyway and we'd
    just suggest that the user try to install the required package based
    on the path to the build-id symlink, e.g.:
    
      Missing separate debuginfo for the main executable file.
      Try: yum --enablerepo='*debug*' install /usr/local/lib/debug/.build-id/bf/c9fbd13046db58c28ba332e6c991240e775c96
    
    This should still work just as it did before.
    
    Now GDB no longer links against librpm I'm able to remove all the
    librpm related stuff from the configure scripts, which is a nice
    cleanup.
    
    There are a couple of patches:
    
      gdb-6.6-buildid-locate-rpm-librpm-workaround.patch
      gdb-6.6-buildid-locate-rpm.patch
    
    which deal exclusively with updating code (added in earlier patches)
    related to the use of librpm from GDB's C++ code, these patches are
    removed by this commit.  Other patches are changed either by the
    removal of the librpm code, or as a consequence of that code having
    been removed.
    
    I've also taken the opportunity to fix up some of the test cases which
    only exist in the Fedora tree so that they will run again.  This is
    mostly just updating the tests to match upstream GDB's current
    testsuite infrastructure, these are all pretty minor fixes.