gnu: Replace all uses of texlive-union by texlive-updmap.cfg.
* doc/build.scm (pdf-manual) Replace texlive-union by texlive-updmap.cfg.
* gnu/packages/algebra.scm (pari-gp): Likewise.
* gnu/packages/bioinformatics.scm (discrover, velvet): Likewise.
* gnu/packages/chez.scm (chez-scheme, chez-web, chez-sockets): Likewise.
* gnu/packages/docbook.scm (dblatex): Likewise.
* gnu/packages/emacs-xyz.scm (emacs-auctex): Likewise.
* gnu/packages/engineering.scm (fastcap): Likewise.
* gnu/packages/guile-xyz.scm (emacsy, guile-cv): Likewise.
* gnu/packages/lisp.scm (sbcl): Likewise.
* gnu/packages/maths.scm (octave, hypre): Likewise.
* gnu/packages/music.scm (lilypond): Likewise.
* gnu/packages/plotutils.scm (asymptote): Likewise.
* gnu/packages/python-xyz.scm (python-numpy-documentation)
(python-matplotlib-documentation, python-ipython-documentation)
(python-pypandoc): Likewise.
* gnu/packages/radio.scm (gnuradio, libosmo-dsp): Likewise.
* gnu/packages/scheme.scm (mit-scheme): Likewise.
* gnu/packages/statistics.scm (r-with-tests): Likewise.
* gnu/packages/tex.scm (simple-texlive-package)
(texlive-xmltex, texlive-tiny, texlive-jadetex, teximpatient, lyx): Likewise.
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