[Patch, Fortran] PR57496 use finiteq etc. for __float in write_float.def

[Tobias Burnus]

Found when looking at the issue of the PR, but unrelated.

For __float128, we have to use the libquadmath functions - not the "long 
double" ones.

The patch is rather obvious, though I wonder whether it could clash with 
some #defines of the system headers on some systems.

Build and regtested on x86-64-gnu-linux.
OK for the trunk?

Tobias
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