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XL: Add support for Ninja and XL Fortran

Brad King requested to merge brad.king/cmake:xlf-ninja into master

The Ninja generator's support for Fortran requires that source files be preprocessed explicitly first. However, the xlf compiler does not have a simple -E option or equivalent to do preprocessing. The only documented way to get preprocessed output is to use -d to leave it behind, but only at an inflexible location.

Instead, create our own cpp wrapper script and substitute it for the real preprocessor using -tF -B .... Teach the wrapper to map the cpp output to the location we need and then invoke the real cpp underneath.

Fixes: #19450 (closed)

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