[v3] fixup ldbl compat issues

[Uros Bizjak]

Hello!

>>  Re: error in hash.cc, fixed with this.
>
> Sigh. With this, hopefully.

Still no luck. Now compilation breaks with:

In file included from
../../../../gcc-svn/trunk/libstdc++-v3/src/compatibility-ldbl.cc:76:0:
../../../../gcc-svn/trunk/libstdc++-v3/src/hash.cc: In member function
'size_t std::tr1::hash<_Tp>::operator()(_Tp) const [with _Tp = long
double, size_t = long unsigned int]':
../../../../gcc-svn/trunk/libstdc++-v3/src/hash.cc:34:15: error:
'frexp' is not a member of 'std'
make[4]: *** [compatibility-ldbl.lo] Error 1
make[4]: Leaving directory
`/space/uros/gcc-build-alpha/alphaev68-unknown-linux-gnu/libstdc++-v3/src'
make[3]: *** [all-recursive] Error 1

Uros.