File libtool-autoconf.patch of Package libchewing

Index: libchewing-0.3.2/configure.ac
===================================================================
--- libchewing-0.3.2.orig/configure.ac
+++ libchewing-0.3.2/configure.ac
@@ -44,6 +44,7 @@ AC_LIBTOOL_DLOPEN
 AC_PROG_LIBTOOL
 #AC_LIB_LTDL
 AC_SUBST(LIBTOOL_DEPS)
+AC_SUBST(LIBTOOL_EXPORT_OPTIONS)
 
 # libtool option to control which symbols are exported
 # right now, symbols starting with _ are not exported