v1.4.8
[contrib][linux-kernel] Fix test warnings
fix gitignore
[contrib][linux] Fix make import-upstream
[linux-kernel] Update README with initial instructions on how to update zstd in the kernel
Add BtrFS benchmarks
[linux] Write all the patch summaries
[contrib][linux] Add SPDX-License-Identifier
Add linux-kernel freestanding
Reorganize zstd_deps.h and mem.h + replace mem.h for the kernel
[kernel] Update README with SquashFS patch
[contrib][linux] Follow style guide more closely