Deflate

* Fixed bug introduced in 1.20 where incorrect checksums could be calculated if
libdeflate was compiled with clang at -O0 and run on a CPU supporting AVX512.

* Fixed bug introduced in 1.20 where incorrect checksums could be calculated in
rare cases on macOS computers that support AVX512 and are running an older
version of macOS that contains a bug that corrupts AVX512 registers. This
could occur only if code outside libdeflate enabled AVX512 in the thread.

* Fixed build error when using -mno-evex512 with clang 18+ or gcc 14+.

* Increased the minimum CMake version to 3.10.

* Further optimized the x86 CRC code.

* The CMake-based build system now implements a workaround for gcc being paired
with a too-old binutils version. This can prevent build errors.

* Fixed build error on x86 with gcc 8.1 and gcc 8.2.

* Fixed build error on x86 when gcc 11 is paired with a binutils version that
doesn't support AVX-VNNI, e.g. as it is on RHEL 9.

* Fixed build error on arm64 with gcc 6.

* Fixed build error on arm64 with gcc 13.1 and later with some -mcpu options.

* Enabled detection of dotprod support in Windows ARM64 builds.

* Improved CRC-32 performance on recent x86 CPUs by adding
VPCLMULQDQ-accelerated implementations using 256-bit and 512-bit vectors.

* Improved Adler-32 performance on recent x86 CPUs by adding
VNNI-accelerated implementations using 256-bit and 512-bit vectors.

* Improved CRC-32 and Adler-32 performance on short inputs.

* Optimized the portable implementation of Adler-32.

* Added some basic optimizations for RISC-V.

* Dropped support for gcc versions older than v4.9 (released in 2014)
and clang versions older than v3.9 (released in 2016).

* Dropped support for CRC-32 acceleration on 32-bit ARM using the ARMv8 pmull or
crc32 instructions. This code only worked on CPUs that also have a 64-bit
mode, and it was already disabled on many compiler versions due to compiler
limitations. CRC-32 acceleration remains fully supported on 64-bit ARM.

* Added new functions `libdeflate_alloc_compressor_ex()` and
`libdeflate_alloc_decompressor_ex()`. These functions allow specifying a
custom memory allocator on a per-compressor basis.

* libdeflate now always generates Huffman codes with at least 2 codewords. This
fixes a compatibility issue where Windows Explorer's ZIP unpacker could not
decompress DEFLATE streams created by libdeflate. libdeflate's behavior was
allowed by the DEFLATE RFC, but not all software was okay with it. In rare
cases, compression ratios can be slightly reduced by this change.

* Disabled the use of some compiler intrinsics on MSVC versions where they don't
work correctly.

* libdeflate can now compress up to the exact size of the output buffer.

* Slightly improved compression performance at levels 1-9.

* Improved the compression ratio of very short inputs.

* Fixed a bug where the build type didn't default to "Release" when using
CMake 3.10 or earlier.

* Fixed a bug where some optimized code wasn't used when building with
Clang 15 or later (x86), or with Clang 16 or later (aarch64).

* Fixed build errors with some architecture and compiler combos:
* aarch64 with Clang 16
* armv6kz or armv7e-m with gcc
* armhf with gcc (on Debian only)