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Brad King authored
The XL Fortran compiler's `-qmoddir=` 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 XL Fortran compiler so that it will be searched when using modules too. This fixes our `FortranModules` test's coverage of submodules on Ninja + XL. That test places module files in a subdirectory that with Ninja is not the current working directory when the compiler runs. Fixes: #20400
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