Merge branch 'patches/dward' of git@gnuradio.org:jcorgan

* 'patches/dward' of git@gnuradio.org:jcorgan:
  #include "config.h" in db_wbxng.cc (for timespec, nanosleep, etc.)
  Add flags and dependencies for MinGW/MSYS.
  Add dependence of gruel on guile; fixes ticket #410.
  Use gruel::mutex instead of pthread_mutex in gr_histo_sink_f.
  Add .gitattributes to fix CRLF problems on MinGW/MSYS