Move out sgsn to its own subdir

Change-Id: I16fccc0eadf588599b9e5578d0f4dbaf9df81737
diff --git a/tests/slhc/Makefile.am b/tests/slhc/Makefile.am
index 818ae2e..b6738c2 100644
--- a/tests/slhc/Makefile.am
+++ b/tests/slhc/Makefile.am
@@ -8,7 +8,7 @@
 slhc_test_SOURCES = slhc_test.c
 
 slhc_test_LDADD = \
-	$(top_builddir)/src/gprs/slhc.o \
+	$(top_builddir)/src/sgsn/slhc.o \
 	$(LIBOSMOCORE_LIBS)