[gfortran] PR libfortran/21376

[FX Coudert]

> Attached patch fixes PR libfortran/21376 (library called log10 with 
> argument equal to zero). Simple reworking of logic to avoid that.
> 
> Regtesting in progress on i686-linux. OK for 4.0 and mainline?

"Attached patch" is now really attached. Sorry.

FX
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