nix: Add PATH of vcsserver derivation to wrapping of other executables.

The other executables like pserve or gunicorn need the same path as
the vcsserver command uses. Otherwise they e.g. find different versions
of git. System git versus custom git in nix-store.

default.nix

@@ -133,6 +133,7 b' let'
 
         for file in $out/bin/*; do
           wrapProgram $file \
+            --prefix PATH : $PATH \
             --prefix PYTHONPATH : $PYTHONPATH \
             --set PYTHONHASHSEED random
         done