[gfortran] patch for PR 15292 missing round and roundf

[Paolo Bonzini]

> (2) We can include a implementation of fpclassify().  I don't have 
>     such code.

if (x != x) can be used to check for NaN.

if (x - x != 0.0) can be used to check for NaN or infinity.

if (x + x == x) can be used to check for infinity or zero.

See the attached test programlet.

Hope this helps,

Paolo
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