Merge pull request #2974 from facebook/fix2966_part3

Lazy parameters adaptation (part 1 - ZSTD_c_stableInBuffer)

diff --cc lib/common/error_private.c
Simple merge

diff --cc lib/compress/zstd_compress.c
Simple merge

diff --cc lib/compress/zstd_compress_internal.h
Simple merge

diff --cc lib/zstd.h
Simple merge

diff --cc tests/fuzzer.c
Simple merge