Revert "libass: add some notes for newer releases"

This reverts commit 960b3b57e2238157f4f60897b691ab145326755d.
libass: update to libass-0.11.1

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add PR4518

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add PR4519

Signed-off-by: Stephan Raue <stephan@openelec.tv>
gmp: update to gmp-6.0.0a

Signed-off-by: Stephan Raue <stephan@openelec.tv>
curl: downgrade to curl-7.34.0, add notes about recent releases

Signed-off-by: Stephan Raue <stephan@openelec.tv>
curl: update to curl-7.36.0

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: add PR4489

Signed-off-by: Stephan Raue <stephan@openelec.tv>