Ninja: Avoid preprocessing twice with explicit Fortran_PREPROCESS
Fix spurious warnings from gfortran+Ninja for preprocessing.
Fixes: #23248 (closed)
Backport: release
Topic-rename: ninja-gfortran-preprocess
Edited by Brad King
Fix spurious warnings from gfortran+Ninja for preprocessing.
Fixes: #23248 (closed)
Backport: release
Topic-rename: ninja-gfortran-preprocess