compiler warnings: add includes in abis_rsl.h, gsm_data_shared.h

Change-Id: Ic0b1410a352c7be399d16d5db7cfe7a62192df6f
diff --git a/include/osmocom/bsc/gsm_data_shared.h b/include/osmocom/bsc/gsm_data_shared.h
index bf67041..45d67f6 100644
--- a/include/osmocom/bsc/gsm_data_shared.h
+++ b/include/osmocom/bsc/gsm_data_shared.h
@@ -21,6 +21,7 @@
 #include <osmocom/abis/e1_input.h>
 #include <osmocom/bsc/common_cs.h>
 #include <osmocom/bsc/meas_rep.h>
+#include <osmocom/bsc/rest_octets.h>
 
 /* 16 is the max. number of SI2quater messages according to 3GPP TS 44.018 Table 10.5.2.33b.1:
    4-bit index is used (2#1111 = 10#15) */