Do not warn about an ununsed function, if it is marked with __attribute__((used)).
[cparser] / parsetest / gnu99 /
2008-08-12 Matthias Braunmore testcases
2008-08-07 Matthias Brauninvalid use of inline (which gcc handles anyway)
2008-08-06 Matthias Braunmore tests
2008-07-31 Matthias Braundo something with some of the gnu attributes
2008-07-30 Matthias Braunreorganized tests