Bug in configure-detection of wxaui

Hi

Building currently fails at least on OSX, but I guess it fails on *nix
too. WXAUI_HOME gets set to the _root_ auf the wxaui sources, but is
later (when doing CPPFLAGS = -I$WXAUI_HOME) assumed to contain the
include directory (<wxaui-root>/include).

The following (trivial) patch helps:
Index: acinclude.m4
===================================================================
--- acinclude.m4        (revision 5245)
+++ acinclude.m4        (working copy)
@@ -516,7 +516,7 @@
  #######################
  AC_DEFUN([SETUP_WXAUI],
  [
-       CPPFLAGS="$CPPFLAGS -I${WXAUI_HOME}"
+       CPPFLAGS="$CPPFLAGS -I${WXAUI_HOME}/include"
  ])

  ###########

greetings, Florian Pflug