Remove redundant DUMP_IMAGES tests from Makefile.am.
tools: remove redefines
Fix unused parameter warnings in check_initial.c
Splitting the 16x16 block size coding into a separate function.

Will make it easier to do the top level.
Fix block size bug when TF'ing luma to 4x4.
More portable wall time

Expands on a patch from Eric L. Camachat for FreeBSD which switched to
using gettimeofday, to also test whether it or ftime is available.
The ftime function is deprecated by POSIX and has moved to libcompat
on FreeBSD, but gettimeofday is not available on Windows, so wrap them
both in our own wall time request function.
Remove gcc dependency from unix/Makefile and tools/unix/Makefile.
tools: add missing include
Initialize constants for all block sizes in init functions.
Remove extraneous README.txt

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>
Removes README.txt from Makefile.am
tools: fix sign-compare warning