Define the extension point name and support variables for panels

The extension point name is used to identify modules that implement
new settings panels using CcPanel.

Also add various libtool flags that will be good practice for new panels.

configure.ac

@@ -277,6 +277,25 @@ AC_SUBST(GNOMECC_CAPPLETS_CLEANFILES)
 AC_SUBST(GNOMECC_CAPPLETS_CFLAGS)
 AC_SUBST(GNOMECC_CAPPLETS_LIBS)
 
+
+
+dnl =======================================
+dnl Panels
+dnl =======================================
+
+PANELS_DIR="${libdir}/control-center-1/panels"
+AC_SUBST(PANELS_DIR)
+
+PANEL_CFLAGS="-I\$(top_srcdir)/libgnome-control-center/"
+AC_SUBST(PANEL_CFLAGS)
+
+PANEL_LIBS="\$(top_builddir)/libgnome-control-center/libgnome-control-center.la"
+AC_SUBST(PANEL_LIBS)
+
+PANEL_LDFLAGS="-export_dynamic -avoid-version -module -no-undefined -export-symbols-regex '^g_io_module_(load|unload)'"
+AC_SUBST(PANEL_LDFLAGS)
+
+
 dnl =======================================
 dnl Update Mime Database
 dnl =======================================

libgnome-control-center/cc-shell.h

@@ -48,6 +48,9 @@ G_BEGIN_DECLS
   (G_TYPE_INSTANCE_GET_CLASS ((obj), \
   CC_TYPE_SHELL, CcShellClass))
 
+
+#define CC_SHELL_PANEL_EXTENSION_POINT "control-center-1"
+
 typedef struct _CcShell CcShell;
 typedef struct _CcShellClass CcShellClass;
 typedef struct _CcShellPrivate CcShellPrivate;