graphviz: provide $PATH to vimdot

vimdot expects dot to be in $PATH [1].
This meant previoiusly vimdot would only work if graphviz was in the $PATH,
breaking vimdot in certain scenarios (e.g. executing `result/bin/vimdot`).
Wrapping vimdot to put the graphviz output bin into PATH fixes this issue.

[1] https://gitlab.com/graphviz/graphviz/-/blob/2649f2366435525085cc79fb1e95ec23c84eb047/plugin/xlib/vimdot.sh#L45

pkgs/tools/graphics/graphviz/default.nix

@@ -12,6 +12,7 @@
 , libjpeg
 , libpng
 , libtool
+, makeWrapper
 , pango
 , bash
 , bison
@@ -43,6 +44,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [
     autoreconfHook
+    makeWrapper
     pkg-config
     python3
     bison
@@ -81,9 +83,11 @@ stdenv.mkDerivation rec {
 
   postFixup = optionalString withXorg ''
     substituteInPlace $out/bin/vimdot \
-      --replace '"/usr/bin/vi"' '"$(command -v vi)"' \
-      --replace '"/usr/bin/vim"' '"$(command -v vim)"' \
-      --replace /usr/bin/vimdot $out/bin/vimdot \
+      --replace-warn '"/usr/bin/vi"' '"$(command -v vi)"' \
+      --replace-warn '"/usr/bin/vim"' '"$(command -v vim)"' \
+      --replace-warn /usr/bin/vimdot $out/bin/vimdot
+
+    wrapProgram $out/bin/vimdot --prefix PATH : "$out/bin"
   '';
 
   passthru.tests = {