djvulibre: move librsvg to nativeBuildInputs

librsvg is only at build time, for generating icons with
rsvg-convert.  Previously, when cross compiling, rsvg-convert wouldn't
be found, and icon generation would be disabled.

pkgs/applications/misc/djvulibre/default.nix

@@ -4,6 +4,7 @@
 , libtiff
 , librsvg
 , libiconv
+, bash
 }:
 
 stdenv.mkDerivation rec {
@@ -17,11 +18,16 @@ stdenv.mkDerivation rec {
 
   outputs = [ "bin" "dev" "out" ];
 
+  strictDeps = true;
+  nativeBuildInputs = [
+    librsvg
+  ];
+
   buildInputs = [
     libjpeg
     libtiff
-    librsvg
     libiconv
+    bash
   ];
 
   meta = with lib; {