vipsdisp: migrate to pkgconf

Author: cho-m

Formula/v/vipsdisp.rb

@@ -16,8 +16,10 @@ class Vipsdisp < Formula
 
   depends_on "meson" => :build
   depends_on "ninja" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
 
+  depends_on "cairo"
+  depends_on "gdk-pixbuf"
   depends_on "glib"
   depends_on "gtk4"
   depends_on "hicolor-icon-theme"