libqalculate: fix build with clang

This addresses a security complaint clang makes about the source code,
and allows the build to succeed on darwin.

pkgs/development/libraries/libqalculate/default.nix

@@ -25,6 +25,9 @@ stdenv.mkDerivation rec {
     substituteInPlace libqalculate/Calculator.cc \
       --replace 'commandline = "gnuplot"' 'commandline = "${gnuplot}/bin/gnuplot"' \
       --replace '"gnuplot -"' '"${gnuplot}/bin/gnuplot -"'
+  '' + stdenv.lib.optionalString stdenv.cc.isClang ''
+    substituteInPlace src/qalc.cc \
+      --replace 'printf(_("aborted"))' 'printf("%s", _("aborted"))'
   '';
 
   preBuild = ''