SGSN: Fixing build config

Tests for V.42bis, slhc, llc-xid and sndcp-xid are built and
executed on all build configurations, but are only needed when
the sgsn (gprs) is built. This patch adds conditions check
if the tests mentioned abvove are needed or not.

Change-Id: I6921e6198ea7f99fe5276f91cbc522091853bc4e
diff --git a/openbsc/tests/testsuite.at b/openbsc/tests/testsuite.at
index f18b734..4905cd1 100644
--- a/openbsc/tests/testsuite.at
+++ b/openbsc/tests/testsuite.at
@@ -126,24 +126,28 @@
 
 AT_SETUP([xid])
 AT_KEYWORDS([xid])
+AT_CHECK([test "$enable_sgsn_test" != no || exit 77])
 cat $abs_srcdir/xid/xid_test.ok > expout
 AT_CHECK([$abs_top_builddir/tests/xid/xid_test], [], [expout], [ignore])
 AT_CLEANUP
 
 AT_SETUP([sndcp_xid])
 AT_KEYWORDS([sndcp_xid])
+AT_CHECK([test "$enable_sgsn_test" != no || exit 77])
 cat $abs_srcdir/sndcp_xid/sndcp_xid_test.ok > expout
 AT_CHECK([$abs_top_builddir/tests/sndcp_xid/sndcp_xid_test], [], [expout], [ignore])
 AT_CLEANUP
 
 AT_SETUP([slhc])
 AT_KEYWORDS([slhc])
+AT_CHECK([test "$enable_sgsn_test" != no || exit 77])
 cat $abs_srcdir/slhc/slhc_test.ok > expout
 AT_CHECK([$abs_top_builddir/tests/slhc/slhc_test], [], [expout], [ignore])
 AT_CLEANUP
 
 AT_SETUP([v42bis])
 AT_KEYWORDS([v42bis])
+AT_CHECK([test "$enable_sgsn_test" != no || exit 77])
 cat $abs_srcdir/v42bis/v42bis_test.ok > expout
 AT_CHECK([$abs_top_builddir/tests/v42bis/v42bis_test], [], [expout], [ignore])
 AT_CLEANUP