x11vnc: Properly hard-code the path to xdpyinfo

This never worked before, I don't think

Signed-off-by: Shea Levy <shea@shealevy.com>

pkgs/tools/X11/x11vnc/default.nix

@@ -23,9 +23,7 @@ stdenv.mkDerivation rec {
         --replace '"/bin/su"' '"/var/setuid-wrappers/su"' \
         --replace '"/bin/true"' '"${coreutils}/bin/true"'
         
-    substituteInPlace x11vnc/ssltools.h \
-        --replace /bin/su /var/setuid-wrappers/su \
-        --replace xdpyinfo ${xorg.xdpyinfo}/bin/xdpyinfo
+    sed -i -e '/#!\/bin\/sh/a"PATH=${xorg.xdpyinfo}\/bin:$PATH\\n"' -e 's|/bin/su|/var/setuid-wrappers/su|g' x11vnc/ssltools.h
   '';
 
   meta = {