* gnu/packages/tex.scm (texlive-scripts): Provide "updmap.cfg", along with
other similar files.
(texlive-default-updmap.cfg): Remove variable.
(texlive-updmap.cfg)[source]: Use TEXLIVE-SCRIPTS source.
[arguments]: Use G-expressions. Adapt #:INSTALL-PLAN according to source change.
* guix/profiles.scm (texlive-font-maps): Use "updmap.cfg" provided by
TEXLIVE-SCRIPTS instead of now defunct TEXLIVE-DEFAULT-UPDMAP.CFG.