libpcre/libpcre2: correct SRC_URI

http://ftp.pcre.org is down, take sources according to links on
http://www.pcre.org



Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 81ba0ba3)
Signed-off-by: Steve Sakoman <steve@sakoman.com>