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NAG: Fix using Fortran modules from their output directory

Brad King requested to merge brad.king/cmake:nag-fortran-include-moddir into master

The NAG Fortran compiler's -mdir flag sets the module output directory but does not add the directory to the search path for using modules. This is inconsistent with other compilers like the GNU Fortran compiler's -J flag that does both. In order to make these consistent, add the module output directory with a -I flag on the NAG Fortran compiler so that it will be searched when using modules too.

We already do this for the XL Fortran compiler since !4405 (merged).

Backport: release

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