Remove obsolete ./configure option

The '--enable-vty-tests' is just alias to '--enable-external-tests'
anyway.

Change-Id: I6230cfcf10247b601e16e7b872305499815520a9
diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index d2db0c9..a32be1e 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -46,12 +46,12 @@
 
 cd "$base"
 autoreconf --install --force
-./configure --enable-sanitize $SMPP $MGCP $IU --enable-vty-tests --enable-external-tests
+./configure --enable-sanitize $SMPP $MGCP $IU --enable-external-tests
 $MAKE $PARALLEL_MAKE
 LD_LIBRARY_PATH="$inst/lib" $MAKE check \
   || cat-testlogs.sh
 LD_LIBRARY_PATH="$inst/lib" \
-  DISTCHECK_CONFIGURE_FLAGS="--enable-osmo-bsc --enable-nat $SMPP $MGCP $IU --enable-vty-tests --enable-external-tests" \
+  DISTCHECK_CONFIGURE_FLAGS="--enable-osmo-bsc --enable-nat $SMPP $MGCP $IU --enable-external-tests" \
   $MAKE distcheck \
   || cat-testlogs.sh