libpcre is needed. Previously, it's available because glib-2.0 depends
on it. Now glib-2.0 has been upgraded and it now depends on libpcre2.
So add this explicit dependency to fix the do_configure failure.
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>