bug#43738: Patch file names too long

[Ludovic Courtès]

There are several patch file names that are too long for ‘tar’, as
reported during ‘make dist’:

--8<---------------cut here---------------start------------->8---
tar: 
guix-1.0.1.22624-c258f1-dirty/gnu/packages/patches/ocaml-bisect-fix-camlp4-in-another-directory.patch
 dosiernomo tro longas (maks 99); ne ŝutita
tar: 
guix-1.0.1.22624-c258f1-dirty/gnu/packages/patches/audiofile-signature-of-multiplyCheckOverflow.patch
 dosiernomo tro longas (maks 99); ne ŝutita
tar: 
guix-1.0.1.22624-c258f1-dirty/gnu/packages/patches/python2-pygobject-2-gi-info-type-error-domain.patch
 dosiernomo tro longas (maks 99); ne ŝutita
tar: 
guix-1.0.1.22624-c258f1-dirty/gnu/packages/patches/audiofile-division-by-zero-BlockCodec-runPull.patch
 dosiernomo tro longas (maks 99); ne ŝutita
tar: 
guix-1.0.1.22624-c258f1-dirty/gnu/packages/patches/python-robotframework-honor-source-date-epoch.patch
 dosiernomo tro longas (maks 99); ne ŝutita
--8<---------------cut here---------------end--------------->8---

‘guix lint’ reports it as well, but apparently this is easily
overlooked.

Ludo’.