[perl #40817] [TODO] track generated files during the configure/make process

[Jerry Gay]

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arguably the best way to track which files are generated during
parrot's configure/build process is to append each file to a list when
it is created. so, we need some makefile hackery in order to do this
during build-time, and some config hackery to do it during
configure-time.

this would replace the MANIFEST.generated file which is created ex
post facto with a file that is created at build-time.
~jerry