ggsn: Fix build broken since recent commit

Fixes: 8c74cbbf5a7534f6aa2d28a30a4b6bff7fe8067b
Change-Id: Id6238a3b79a4439ab3b17909c7b1c65028efbec3
diff --git a/ggsn_tests/regen_makefile.sh b/ggsn_tests/regen_makefile.sh
index 6db1a3d..6afd5d9 100755
--- a/ggsn_tests/regen_makefile.sh
+++ b/ggsn_tests/regen_makefile.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
 
-FILES="*.ttcn IPL4asp_PT.cc  IPL4asp_discovery.cc  TCCConversion.cc  TCCInterface.cc GTPC_EncDec.cc GTPU_EncDec.cc GTP_CodecPort_CtrlFunctDef.cc ICMPv6_EncDec.cc IP_EncDec.cc Native_FunctionDefs.cc UDP_EncDec.cc ICMP_EncDec.cc TELNETasp_PT.cc"
+FILES="*.ttcn IPL4asp_PT.cc  IPL4asp_discovery.cc  TCCConversion.cc  TCCInterface.cc GTPC_EncDec.cc GTPU_EncDec.cc GTP_CodecPort_CtrlFunctDef.cc ICMPv6_EncDec.cc IP_EncDec.cc Native_FunctionDefs.cc UDP_EncDec.cc ICMP_EncDec.cc TELNETasp_PT.cc BSSGP_EncDec.cc"
 
 ../regen-makefile.sh GGSN_Tests.ttcn $FILES