boost.m4 THANKS file

The following persons contributed to boost.m4 by reporting problems,
suggesting improvements, submitting patches or proofreading the code.

Akim Demaille
Alexandre Rostovtsev
Anthony Mallet
Aurimas Černius
Bastien Nocera
Bernd Prager
Daniel Herring
Giles Hall
Hubert Figuière
Jens Seidel
Jeremy Powell
Nathan Phillip Brink
Paul Balomiri
Peter Waller
Rhys Ulerich
Staffan Gimåker
Sven Hesse
Thomas Moulard
