gnu: i3-wm: Update to 4.13.

* gnu/packages/wm.scm (i3-wm): Update to 4.13.
[arguments]: Pass '-std=c11' to #:make-flags. Provide path to XML_CATALOG_FILES.
Pass '--disable-builddir' to #:configure-flags. Re-enable the 'configure' phase
to adjust to new Autotools build system.
[inputs]: Add xcb-util-xrm.
[native-inputs]: Add docbook-xsl.