melonDS: add libpcap to library path (#139787)

melonDS loads libpcap dynamically using dlopen.

pkgs/misc/emulators/melonDS/default.nix

@@ -26,12 +26,13 @@ mkDerivation rec {
   buildInputs = [
     epoxy
     libarchive
-    libpcap
     libslirp
     qtbase
     SDL2
   ];
 
+  qtWrapperArgs = [ "--prefix LD_LIBRARY_PATH : ${lib.makeLibraryPath [ libpcap ]}" ];
+
   meta = with lib; {
     homepage = "http://melonds.kuribo64.net/";
     description = "Work in progress Nintendo DS emulator";