bug#53297: Provide option to use perl with grep

[Jacob Hrbek]

$ grep -rnwP '(inputs.* ._)' -A 20 gnu/packages/_.scm
grep: Perl matching not supported in a --disable-perl-regexp build

^ Expecting this to work< but perl dependency is only defined for build-time and the package lacks option to include Perl on demand

--
Jacob Hrbek

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