* gnu/packages/documentation.scm (doxygen): Update to 1.8.17. [source](patches): Add doxygen-1.8.17-runtests.patch. [arguments]: Remove obsolete phase. * gnu/packages/patches/doxygen-test.patch: Adjust for upstream changes. * gnu/packages/patches/doxygen-1.8.17-runtests.patch: New file. * gnu/local.mk (dist_patch_DATA): Adjust accordingly.