gnu: linkchecker: Shorten patch file name.

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.

gnu/local.mk

@@ -1031,7 +1031,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/lierolibre-newer-libconfig.patch		\
   %D%/packages/patches/lierolibre-remove-arch-warning.patch	\
   %D%/packages/patches/lierolibre-try-building-other-arch.patch	\
-  %D%/packages/patches/linkchecker-mark-more-tests-that-require-the-network.patch	\
+  %D%/packages/patches/linkchecker-tests-require-network.patch	\
   %D%/packages/patches/linux-pam-no-setfsuid.patch		\
   %D%/packages/patches/lirc-localstatedir.patch			\
   %D%/packages/patches/lirc-reproducible-build.patch		\

gnu/packages/web.scm

@@ -5435,8 +5435,7 @@ Instagram and YouTube.")
              (url "https://github.com/linkchecker/linkchecker")
              (commit (string-append "v" version))))
        (patches
-        (search-patches
+        (search-patches "linkchecker-tests-require-network.patch"))
-         "linkchecker-mark-more-tests-that-require-the-network.patch"))
        (file-name (git-file-name name version))
        (sha256
         (base32