webkit: bump to version 1.9.6

Remove bison-2.6-compat patch as it has been incorporated upstream.
Remove fix build issue with old gtk as gtk has been bumped to a newer
version.
Remove fix-build-with-gcc-4-6 as it has incorporated upstream.
Remove directfb patches due to depreciation
Remove pool patch as it is no longer required
Remove pthread_getattr_np as webkit no longer uses this function.

Signed-off-by: Spenser Gilliland <spenser@gillilanding.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>