* gnu/packages/patches/isc-dhcp-4.4.1-fixes-for-newer-bind.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/admin.scm (isc-dhcp): Update BIND version to 9.11.9.
[arguments]: In the 'replace-bundled-bind' phase, apply the patch. In the
'post-configure' phase: Refine a substitute* regexp to avoid substituting an
instance of "./configure.log" in the BIND Makefile. Substitute /usr/bin/file
in the BIND configure script.
[native-inputs]: Add 'file', 'patch', and the patch.
[inputs]: Update the hash of bind-source-tarball.
Mark H Weaver