gdk-pixbuf: expose additional configure flags (#5981)

--without-modules (mapped to --disable-modules)
--with-included-loaders=

Formula/gdk-pixbuf.rb

@@ -13,6 +13,8 @@ class GdkPixbuf < Formula
 
   option :universal
   option "with-relocations", "Build with relocation support for bundles"
+  option "without-modules", "Disable dynamic module loading"
+  option "with-included-loaders=", "Build the specified loaders into gdk-pixbuf"
 
   depends_on "pkg-config" => :build
   depends_on "glib"
@@ -52,6 +54,10 @@ class GdkPixbuf < Formula
     ]
 
     args << "--enable-relocations" if build.with?("relocations")
+    args << "--disable-modules" if build.without?("modules")
+
+    included_loaders = ARGV.value("with-included-loaders")
+    args << "--with-included-loaders=#{included_loaders}" if included_loaders
 
     system "./configure", *args
     system "make"