Remove regex-based export control

All export control is now happening through annotations
in the headers.

configure.ac

@@ -508,16 +508,6 @@ PKG_CHECK_MODULES(CAIRO_BACKEND, [$cairo_backends])
 
 PKG_CHECK_MODULES(GMODULE, [gmodule-2.0])
 
-if test "$os_win32" != yes; then
-    # libtool option to control which symbols are exported
-    # right now, symbols starting with _ are not exported
-    LIBTOOL_EXPORT_OPTIONS='-export-symbols-regex "^[[^_]].*"'
-else
-    # We currently use .def files on Windows (for gdk and gtk)
-    LIBTOOL_EXPORT_OPTIONS=
-fi
-AC_SUBST(LIBTOOL_EXPORT_OPTIONS)
-
 dnl ******************************************************
 dnl * See whether to include shared library dependencies *
 dnl ******************************************************

gdk/Makefile.am

@@ -54,8 +54,7 @@ LDADD = 					\
 	-version-info $(LT_VERSION_INFO)	\
 	-export-dynamic 			\
 	-rpath $(libdir) 			\
-	$(no_undefined)				\
-	$(LIBTOOL_EXPORT_OPTIONS)
+	$(no_undefined)
 
 #
 # setup source file variables

gtk/Makefile.am

@@ -121,7 +121,7 @@ deps = \
 libtool_opts =							\
   $(GTK_LINK_FLAGS)						\
   -version-info $(LT_VERSION_INFO)				\
-  -export-dynamic $(no_undefined) $(LIBTOOL_EXPORT_OPTIONS)	\
+  -export-dynamic $(no_undefined)				\
   -rpath $(libdir) $(libgtk_target_ldflags)