Release v1.5.2 on 2021-09-24.

1. e08da97 Fix/Update copyright notices; Add SPDX annotation by Harald Welte · 7 years ago
2. 81dc67d Ensure __always_inline is defined on operating systems that don't have it by Harald Welte · 7 years ago
3. 17518fe doxygen: unify use of \file across the board by Neels Hofmeyr · 7 years ago
4. 46e533c core/conv: update description headers for conv_acc_* by Vadim Yanitskiy · 7 years ago
5. e4fe71c core/conv: use proper filenames by Vadim Yanitskiy · 7 years ago[Renamed from src/viterbi_sse_common.h]
6. 0d49f47 core/conv: do not mix up AVX and SSE code by Vadim Yanitskiy · 7 years ago