[Geany] Add notebook.* to the makefil

[Pierre]

Hello,

Just a little patch for the current head, the notebook.* files are
missing in Makefile.am.

Cheers,
--Pierre
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Index: Makefile.am
===================================================================
--- Makefile.am	(revision 536)
+++ Makefile.am	(working copy)
@@ -34,7 +34,8 @@
 	vte.c vte.h \
 	support.c support.h \
 	interface.c interface.h \
-	callbacks.c callbacks.h
+	callbacks.c callbacks.h \
+	notebook.c notebook.h 
 
 #AM_CFLAGS = -Wall -pipe
 #AM_CFLAGS = -DGEANY_DEBUG -Wall -pipe