TEncSearch: fix comment for TEncSearch::predInterSearch
cmake: do not query clang version, it is not used
cmake: give 16bpp vector sad primitives their own C++ file

--HG--
rename : source/common/vec/pixel16.inc => source/common/vec/pixel16-sse41.cpp
extra : amend_source : 8f420b5d5bc04bbdebb856640d1f2c8cb28c9dd0
pixel: cleared the bug in sse_sp4.
pixel: modified weightUnidir to clear the bug.
pixel: cleared the bug in sse_sp8, through sse_sp64
Fixed the --me 4 cli option error
pixel: fix 16bpp build
ipfilter: Fix for 16bpp build