gnu: singular: Remove package labels.

* gnu/packages/algebra.scm (singular)[inputs]: Remove package labels.

Change-Id: Iecdcf07df4c0f18c0305a8f990d4a2e3c832cdd6
Signed-off-by: Andreas Enge <andreas@enge.fr>

gnu/packages/algebra.scm

@@ -619,13 +619,13 @@ matrices, and polynomials over the integers and over finite fields.")
    (native-inputs
     (list doxygen graphviz perl))
    (inputs
-    `(("cddlib" ,cddlib)
-      ("gmp" ,gmp)
-      ("flint" ,flint)
-      ("mpfr" ,mpfr)
-      ("ntl" ,ntl)
-      ("python" ,python-2)
-      ("readline" ,readline)))
+    (list cddlib
+          gmp
+          flint
+          mpfr
+          ntl
+          python-2
+          readline))
    (arguments
     `(#:configure-flags
       (list (string-append "--with-ntl="