api: add support for access unit delimiters (--aud)
testbench: prevent 0 height in plane copy tests

The ASM functions handle the last row specially and cannot handle height of 0,
it causes testbench crashes when rand() rolls the wrong dice.
log: move logging of version and build info into libx265

Now this data will be reported in the logs even when x265 is used as a shared or
static library

--HG--
extra : amend_source : 85f4f92073593b395831a5439e0bdbf2e40eae36