This file name was too long for 'tar', as reported by 'guix lint'.
* gnu/packages/patches/linkchecker-mark-more-tests-that-require-the-network.patch:
Rename to...
* gnu/packages/patches/linkchecker-tests-require-network.patch: ... this.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/web.scm (linkchecker)[source]: Likewise.
Ludovic Courtès