* gnu/packages/version-control.scm (reposurgeon): Update to 3.43.
[source]: Add a patch needed to build the package.
[arguments]: Add ‘patch-inputs’ phase.
[native-inputs]: Replace docbook-xml-4.1.2 with the latest docbook-xml.
[inputs]: Add tzdata.
* gnu/packages/patches/reposurgeon-add-missing-docbook-files.patch:
New file.
* gnu/local.mk (dist_patch_DATA): Add it.
