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The boundary between using an origin snippet versus a build phase to
modify the sources of a package can be elusive. Origin snippets are
typically used to remove unwanted files such as bundled libraries,
nonfree sources, or to apply simple substitutions. The source derived
from an origin should produce a source that can be used to build the
package on any system that the upstream package supports (i.e., act as
the corresponding source). In particular, origin snippets must not
embed store items in the sources; such patching should rather be done
using build phases. Refer to the origin record documentation for
more information (see origin Reference).