configure: remove accel build options

The --disable-[accel name] switches of the configure script are a
nightmare to maintain. They break with every bump of FFmpeg, and don't
work right half the time.

Keep only global switch --disable-accel.

Change-Id: I6b645f7102abb3903c27d7dac7d70f7f15a5e728
Reviewed-by: Olivier Soldano <olivier.soldano@savoirfairelinux.com>