directfb: bump to 1.7.7

In addition to doing the bump, this commit changes the --enable-fusion
option to --enable-multi-kernel, as was renamed upstream.

The patches were just refreshed, except
0003-remove-redefinition-of-__typeof__.patch, which was removed since
it was a backport from upstream, and is therefore now part of DirectFB
1.7.7.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Tested-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>