Updated support for binary128:

  * __float128 was changed to _Float128 (ISO/IEC TS 18661) in r12391;
    also changed the suffix of the constants from "q" to "f128".
  * Use __float128 with the "q" suffix as a fallback in order to avoid
    regressions with GCC 6- and with C++ mode (g++).
    As documented in the GCC manual, this is entirely compatible on most
    platforms where both are supported: _Float128 and __float128 are the
    same type, and it could be checked that the following prototypes are
    equivalent (as expected):
      _Float128 f (__float128)
      __float128 f (_Float128)
    The only potential issues would be on hppa and IA-64 HP-UX, where
    __float128 is an alias for "long double" instead of _Float128, in
    case the ABI would be different (I have no information about this)
    and both would be mixed up with software using the MPFR conversion
    functions for binary128 via __float128 or "long double". The worst
    thing that could happen is a link error. If the link is accepted,
    everything should be fine as the representation doesn't change.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@12444 280ebfd0-de03-0410-8827-d642c229c3f4

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