gnu: Deprecate `texlive-tiny'.

At this point, there are three equivalent TeX Live sub-systems:
texlive-scheme-basic, texlive-tiny, and (texlive-updmap.cfg).  It is confusing
to keep so many around.

* doc/contributing.texi (Submitting Patches): Remove reference to
TEXLIVE-TINY.
* gnu/packages/algebra.scm (pari-gp)[native-inputs]:
(giac)[native-inputs]:
* gnu/packages/chez.scm (chez-sockets)[native-inputs]:
* gnu/packages/engineering.scm (fastcap)[native-inputs]:
* gnu/packages/gettext.scm (po4a)[native-inputs]:
* gnu/packages/maths.scm (cddlib)[native-inputs]:
(gnuplot)[native-inputs]:
(itpp)[native-inputs]:
* gnu/packages/ocaml.scm (unison)[native-inputs]:
* gnu/packages/pdf.scm (extractpdfmark)[native-inputs]:
* gnu/packages/photo.scm (enblend-enfuse): Replace TEXLIVE-TINY with a call to TEXLIVE-UPDMAP.CFG.
* gnu/packages/radio.scm (gnuradio)[native-inputs]: Remove unnecessary
TEXLIVE-TINY.
* gnu/packages/tex.scm (texlive-tiny): Deprecate it in favor of TEXLIVE-SCHEME-BASIC.
(texlive-makecmds)[native-inputs]:  Replace TEXLIVE-TINY with a call to TEXLIVE-UPDMAP.CFG.
* guix/lint.scm (check-inputs-should-be-native): Check only for
"texlive-updmap.cfg" input name.

gnu/packages/gettext.scm

@@ -292,7 +292,7 @@ from Markdown files.")
            ;; For tests.
            docbook-xml-4.1.2
            perl-test-pod
-           texlive-tiny))
+           (texlive-updmap.cfg)))
     (inputs
      (list bash-minimal
            perl-gettext