Improved gtk+ to be able to build without libtiff or libjpeg

gtk+/gtk+/gtk+.conf

@@ -2,6 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../gtk+/gtk+.conf
+# Copyright (C) 2008 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 # Copyright (C) 1998 - 2004 Clifford Wolf
 #
@@ -17,5 +18,11 @@
 # --enable-fbmanager  enable framebuffer manager support (GtkFB)
 var_append confopt ' ' '--with-xinput=yes'
 
+for x in libtiff libjpeg; do
+	if ! pkginstalled $x; then
+		var_append extraconfopt ' ' "--without-$x"
+	fi
+done
+
 [ $arch = powerpc64 ] && var_append GCC_WRAPPER_APPEND ' ' -mminimal-toc