treewide: remove bash snippets in flags

Co-Authored-By: Jan Tojnar <jtojnar@gmail.com>

pkgs/applications/networking/instant-messengers/blink/default.nix

@@ -44,11 +44,6 @@ mkDerivationWith pythonPackages.buildPythonApplication rec {
 
   dontWrapQtApps = true;
 
-  makeWrapperArgs = [
-    "\${qtWrapperArgs[@]}"
-    "--prefix LD_LIBRARY_PATH: ${gnutls.out}/lib"
-  ];
-
   postInstall = ''
     mkdir -p "$out/share/applications"
     mkdir -p "$out/share/pixmaps"
@@ -56,6 +51,13 @@ mkDerivationWith pythonPackages.buildPythonApplication rec {
     cp "$out"/share/blink/icons/blink.* "$out/share/pixmaps"
   '';
 
+  preFixup = ''
+    makeWrapperArgs+=(
+      --prefix "LD_LIBRARY_PATH" ":" "${gnutls.out}/lib"
+      "''${qtWrapperArgs[@]}"
+    )
+  '';
+
   meta = with stdenv.lib; {
     homepage = http://icanblink.com/;
     description = "A state of the art, easy to use SIP client for Voice, Video and IM";