gnu: dot2tex: Fix failing tests.

TeX Live packages needed to build tests are moved to native inputs because
propagating them may not be a good thing.  Use might already be using
monolithic TeX Live, or would may have their TeX Live installation on another system.

* gnu/packages/graphviz.scm (dot2tex)[native-inputs]: Add TeX Live packages
necessary to build documents generated during tests.
[propagated-inputs]: Remove them.

gnu/packages/graphviz.scm

@@ -379,21 +379,17 @@ graphs in Graphviz's DOT language, written in pure Python.")
                         ;; (see:
                         ;; https://github.com/kjellmf/dot2tex/issues/94).
                         "-k" "not test_semicolon")))))))
-    (native-inputs (list python-pytest))
+    (native-inputs
+     (list python-pytest
+           (texlive-updmap.cfg
+            (list texlive-geometry
+                  texlive-pgf
+                  texlive-preview
+                  texlive-pstricks
+                  texlive-xcolor
+                  texlive-xkeyval))))
     (inputs (list graphviz))
-    (propagated-inputs
+    (propagated-inputs (list python-pyparsing))
-     (list python-pyparsing
-           ;; These TeX dependencies are propagated to make it easier to build
-           ;; the resulting generated TeX files, which \usepackage them.
-           texlive-amsmath
-           texlive-bin
-           texlive-geometry
-           texlive-latex-bin
-           texlive-pgf
-           texlive-pstricks
-           texlive-preview
-           texlive-xcolor
-           texlive-xkeyval))
     (home-page "https://github.com/kjellmf/dot2tex")
     (synopsis "Graphviz to LaTeX converter")
     (description