weston: Add PACKAGECONFIG for poppler

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
wget: Add dependency on libpcre

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
x11vnc: Add PACKAGECONFIG for xfixes, xinerama, xrandr and xdamage

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
guile: Add PACKAGECONFIG for readline

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>