zlib-ng: AppleClang 8: error: initializing '__m256i' (vector of 4 'long long' values) with an expression of incompatible type 'int'

I library I use (ITK) recently updated to zlib-ng 2022-04-27 (d41f8ead) (from what I’m not sure) and it now fails to build on macOS 10.11 with AppleClang 8, with:

/Users/builder/external/ITK/Modules/ThirdParty/ZLIB/src/itkzlib-ng/arch/x86/adler32_avx2.c:55:13: error: initializing '__m256i' (vector of 4 'long long' values) with an expression
      of incompatible type 'int'
    __m256i vs1 = _mm256_zextsi128_si256(_mm_cvtsi32_si128(adler));
            ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/builder/external/ITK/Modules/ThirdParty/ZLIB/src/itkzlib-ng/arch/x86/adler32_avx2.c:56:13: error: initializing '__m256i' (vector of 4 'long long' values) with an expression
      of incompatible type 'int'
    __m256i vs2 = _mm256_zextsi128_si256(_mm_cvtsi32_si128(sum2));
            ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

See: https://open.cdash.org/viewBuildError.php?buildid=7889929

Perhaps X86_AVX2_ADLER32 should not be set for this compiler and/or macOS deployment target?