use new libosmocore gsm_23_003.h for IMEI/IMSI length
... rather than our private definitions everwhere. As an added benefit,
gprs_gsup_messages.h is now free of any header dependencies within
openbsc.
diff --git a/openbsc/src/gprs/gprs_gsup_messages.c b/openbsc/src/gprs/gprs_gsup_messages.c
index 0b1dc9b..b3c8dab 100644
--- a/openbsc/src/gprs/gprs_gsup_messages.c
+++ b/openbsc/src/gprs/gprs_gsup_messages.c
@@ -31,6 +31,7 @@
#include <osmocom/gsm/tlv.h>
#include <osmocom/core/msgb.h>
+#include <osmocom/gsm/gsm48_ie.h>
#include <stdint.h>