vim-plugins: add {pre,post}Install hooks to buildVimPlugin

pkgs/misc/vim-plugins/vim-utils.nix

@@ -383,6 +383,8 @@ rec {
     unpackPhase ? "",
     configurePhase ? "",
     buildPhase ? "",
+    preInstall ? "",
+    postInstall ? "",
     path ? (builtins.parseDrvName name).name,
     addonInfo ? null,
     ...
@@ -390,9 +392,11 @@ rec {
     addRtp "${rtpPath}/${path}" (stdenv.mkDerivation (a // {
       name = namePrefix + name;
 
-      inherit unpackPhase configurePhase buildPhase addonInfo;
+      inherit unpackPhase configurePhase buildPhase addonInfo preInstall postInstall;
 
       installPhase = ''
+        runHook preInstall
+
         target=$out/${rtpPath}/${path}
         mkdir -p $out/${rtpPath}
         cp -r . $target
@@ -401,6 +405,8 @@ rec {
         if [ -n "$addonInfo" ]; then
           echo "$addonInfo" > $target/addon-info.json
         fi
+
+        runHook postInstall
       '';
     }));