[Fortran, Patch] PR33862 - Support .ftn/.FTN file extension and use CPP for .FOR

[Tobias Burnus]

:ADDPATCH fortran:

This patch adds support for .ftn to gfortran, which is treated as
fixed-form Fortran source code. ".FTN" is fixed-form plus preprocessor
(in line with other vendors). I also changed .FOR to use the
preprocessor to be in line with g95, ifort, sunf95, openf95.

I also added .for (and .ftn) to the info page.

Built and currently regression testing on x86-64/Linux (still running).
OK (unless regtest fails)?

Tobias
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