Add missing ac makefile. Fixes broken ac build.

xpfe/xpviewer/public/Makefile.in

@@ -0,0 +1,32 @@
+#
+# The contents of this file are subject to the Netscape Public License
+# Version 1.0 (the "NPL"); you may not use this file except in
+# compliance with the NPL.  You may obtain a copy of the NPL at
+# http://www.mozilla.org/NPL/
+#
+# Software distributed under the NPL is distributed on an "AS IS" basis,
+# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+# for the specific language governing rights and limitations under the
+# NPL.
+#
+# The Initial Developer of this code under the NPL is Netscape
+# Communications Corporation.  Portions created by Netscape are
+# Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+# Reserved.
+# 
+
+DEPTH	= ../../..
+topsrcdir	= @top_srcdir@
+srcdir		= @srcdir@
+VPATH		= @srcdir@
+
+include $(DEPTH)/config/autoconf.mk
+
+EXPORTS = \
+	nsIXPBaseWindow.h \
+	nsWindowListener.h \
+	$(NULL)
+
+EXPORTS := $(addprefix $(srcdir)/, $(EXPORTS))
+
+include $(topsrcdir)/config/rules.mk