Merge pull request #2907 from Hello71/armv6-fix-legacy

Apply FORCE_MEMORY_ACCESS=1 to legacy

diff --cc lib/legacy/zstd_v01.c
Simple merge

diff --cc lib/legacy/zstd_v02.c
Simple merge

diff --cc lib/legacy/zstd_v03.c
Simple merge

diff --cc lib/legacy/zstd_v04.c
Simple merge

diff --cc lib/legacy/zstd_v05.c
Simple merge

diff --cc lib/legacy/zstd_v06.c
Simple merge

diff --cc lib/legacy/zstd_v07.c
Simple merge