build: fix distcheck: include gen scripts in EXTRA_DIST

Change-Id: Id94d2fe83f080a18a2a686206bd21cf5fafe2fa7
diff --git a/utils/Makefile.am b/utils/Makefile.am
index e95f546..51af3d8 100644
--- a/utils/Makefile.am
+++ b/utils/Makefile.am
@@ -2,6 +2,8 @@
 AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include $(TALLOC_CFLAGS)
 AM_CFLAGS = -Wall
 
+EXTRA_DIST = conv_gen.py conv_codes_gsm.py
+
 bin_PROGRAMS = osmo-arfcn osmo-auc-gen
 
 osmo_arfcn_SOURCES = osmo-arfcn.c