[gfortran, patch] PR libfortran/19155

[François-Xavier Coudert]

Last corner case of PR libfortran/19155, which still failed on AIX. We
relied on strtod returning either 0 or ERANGE, but it can return
EINVAL too. In that case (it happens when we it is passed an empty
string), we should proceed and not issue an error.

This is a very simple patch, regtested on i686-linux. OK for mainline
and 4.0? (I must admit I was tempted to commit this one as obvious)
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