[gfortran] patch for mixed C-Fortran I/O

[FX Coudert]

>>Built and regtested on i686-linux. Comes with a testcase. OK for
>>mainline and 4.0 (after due testing)?

Commited, as well as an additional patch (attached, considered obvious) 
to enable the use of dg-additional-sources in 4.0 (it was only enabled 
in mainline before).

FX
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