wicdec: silence a format warning

from x86_64-w64-mingw32-gcc

examples/wicdec.c: In function ‘ExtractICCP’:
examples/wicdec.c:131:21: warning: format ‘%u’ expects argument of type
‘unsigned int’, but argument 4 has type ‘size_t’ [-Wformat]

Change-Id: I6642dae62265a2276ae9ac96dd8ce6f1e2d37ca5
Merge "wicdec: silence a format warning"
Don't set alpha-channel to 0xff for alpha->green uplift

usually saves ~4 bytes on average (but, up to 10 -or even 16- sometimes).

Change-Id: Ib500e1a35471a2f3da453ffc8c7e95d28b8d34fe
change the bytes_per_pixels_ field into more evocative use_8b_decode

+ split AllocateInternalBuffers() into two 32b/8b variants instead of
trying to do everything in one function.

Change-Id: I35cac9fcd990a2194c95da4b2a4046ca3a514343
Speedup for decoding lossless WebP photographs:

use bit_pos instead num_bit to update the bit-reader
37.69 MB/s -> 39.79 MB/s, 5.6 %

Change-Id: Ica476cc3e2fc2db084d6961bea8586b050bb221d
~20% faster lossless decoding

We use help from small LUTs for Huffman decoding.

Change-Id: I58db4ecd37282822094519f2aa14cf544beba975