I get the idea, but I don't think we can call .patch files inside
phases, the patches directory is not exposed/available inside
build-environment.
If the relevant patch files are added to 'inputs' or 'native-inputs',
then they are available in the build environment. As an example,
see the "libpng-apng" package. It adds the patch to 'inputs'
(named "apng") and invokes "patch" during the 'patch-apng' phase.
The "apng" input uses an 'origin' reference, but you could use
(local-file ...) there as well. Or beter: use 'search-patch'
instead.
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