app-office/abiword: Multiple bug fixes

app-office/abiword: Multiple bug fixes

- Fix flickering with recent GTK+ versions (#601300)
- cairo[X] looks to not be needed, don't rdepend on it (as other
  distributions do too) (#618756)
- Fix compilation issues (#656026)
- Fix libical3 compatibility (#677072)
- Don't force smooth scrolling (from Debian, upstreamed)

Closes: https://bugs.gentoo.org/601300
Closes: https://bugs.gentoo.org/618756
Closes: https://bugs.gentoo.org/656026
Closes: https://bugs.gentoo.org/677072
Package-Manager: Portage-2.3.62, Repoman-2.3.12
Signed-off-by: Pacho Ramos <pacho@gentoo.org>