selftest: add missing Native_FunctionDefs.cc

Fix for:
/usr/bin/ld: Native_Functions.so: undefined reference to `Native__Functions::f__str__tolower(CHARSTRING const&)'
/usr/bin/ld: Native_Functions.so: undefined reference to `Native__Functions::f__inet__hntoa(OCTETSTRING const&)'
/usr/bin/ld: Native_Functions.so: undefined reference to `Native__Functions::f__inet__haddr(CHARSTRING const&)'
/usr/bin/ld: BSSMAP_Templates.so: undefined reference to `Native__Functions::f__inet6__addr(CHARSTRING const&)'
/usr/bin/ld: BSSMAP_Templates.so: undefined reference to `Native__Functions::f__inet__addr(CHARSTRING const&)'
/usr/bin/ld: Native_Functions.so: undefined reference to `Native__Functions::f__str__toupper(CHARSTRING const&)'
/usr/bin/ld: Native_Functions.so: undefined reference to `Native__Functions::f__inet__ntoa(OCTETSTRING const&)'

Related: OS#5252
Change-Id: I73c225f6699cd272b3eeffb249f3dddd2048bc01
diff --git a/selftest/regen_makefile.sh b/selftest/regen_makefile.sh
index bd2ae91..17854ce 100755
--- a/selftest/regen_makefile.sh
+++ b/selftest/regen_makefile.sh
@@ -8,6 +8,7 @@
 	IPA_CodecPort_CtrlFunctDef.cc
 	IPL4asp_PT.cc
 	IPL4asp_discovery.cc
+	Native_FunctionDefs.cc
 	TCCConversion.cc
 	TCCInterface.cc
 "