[Patch, Fortran] PR53985 add missing case to -Wc-binding-type

[Tobias Burnus]

gfortran always warned for BIND(C) procedures if one used "integer", 
"integer(4)" etc. instead of "integer(c_int)". While the latter is 
surely more portable than the former, all of them are identical on 
nearly all systems. Hence, the other versions are rahter widely used.

In order to reduce the clutter due to default warnings, since GCC 4.8 
there is a new warning -Wc-binding-type, which is turned off by default. 
However, for some reason, it misses the most common case. That's now 
fixed in the attachment. I also corrected the wording.

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

Tobias
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