[gfortran] Adding quite a few intrinsics

[François-Xavier Coudert]

> OK for mainline.  OK for 4.0.x once you've regression
> tested on 4.0.x.

I plan to commit to 4.0 with the following changes if noone objects
(4.0 doesn't have the sread and swrite stream functions). Regtested on
ppc-darwin.

FX
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