[m-rev.] diff: update config.guess and config.sub

[Julien Fischer]

Update config.guess and config.sub.

config.guess:
config.sub:
     Update these files from 2012-02-1 to 2015-01-01.  The existing
     versions do not recognise *-pc-msys architecture (i.e. MSYS2).

<diff omitted>