SNDCP: add V.42bis data compression functionality

 - Add compression control for V.42bis Add code to handle compression
   (gprs_sndcp_dcomp.c/h)
 - Add Adjustments in SNDCP
 - Add VTY commands

Change-Id: I6d36cbdf2f5c5f83ca9ba57c70452f02b8582e7e
diff --git a/openbsc/include/openbsc/Makefile.am b/openbsc/include/openbsc/Makefile.am
index 3014d5f..c6a0149 100644
--- a/openbsc/include/openbsc/Makefile.am
+++ b/openbsc/include/openbsc/Makefile.am
@@ -26,6 +26,7 @@
 	gprs_sgsn.h \
 	gprs_sndcp.h \
 	gprs_sndcp_comp.h \
+	gprs_sndcp_dcomp.h \
 	gprs_sndcp_pcomp.h \
 	gprs_sndcp_xid.h \
 	gprs_utils.h \