CI: Use bundled jansson if needed.

Use pkg-config to determine if jansson is installed, enabled bundled
version otherwise.

Change-Id: Ib555a8b72ff6f6925f9280ef035caa0b91ca4bd2

tests/CI/buildAsterisk.sh

@@ -73,9 +73,11 @@ runner ccache -s
 runner ulimit -a
 
 MAKE=`which make`
+PKGCONFIG=`which pkg-config`
 [ -d /usr/lib64 ] && _libdir=/usr/lib64
 
 common_config_args="--prefix=/usr ${_libdir:+--libdir=${_libdir}} --sysconfdir=/etc --with-pjproject-bundled"
+$PKGCONFIG 'jansson' || common_config_args+=" --with-jansson-bundled"
 common_config_args+=" ${CACHE_DIR:+--with-sounds-cache=${CACHE_DIR}/sounds --with-externals-cache=${CACHE_DIR}/externals}"
 common_config_args+=" --enable-dev-mode"
 if [ $COVERAGE -eq 1 ] ; then