avcodec/libaomenc: Added more commandline options

The following are the newly added options:
arnr_max_frames, arnr_strength, aq_mode, denoise_noise_level, denoise_block_size,
rc_undershoot_pct, rc_overshoot_pct, minsection_pct, maxsection_pct, frame_parallel,
enable_cdef, enable_global_motion, and intrabc.

Also added macros for compiling for aom 1.0.0 and fixed the default values.
Signed-off-by: James Almer <jamrial@gmail.com>