Meson: Fail to build with clang-cl

I'm trying to add Opus to Meson's WrapDB, but it fails the clang-cl CI:

FAILED: subprojects/opus-1.4/silk/libsilk_sse4_1.a.p/x86_NSQ_sse4_1.c.obj 
"clang-cl" "-Isubprojects\opus-1.4\silk\libsilk_sse4_1.a.p" "-Isubprojects\opus-1.4\silk" "-I..\subprojects\opus-1.4\silk" "-Isubprojects\opus-1.4" "-I..\subprojects\opus-1.4" "-Isubprojects\opus-1.4\include" "-I..\subprojects\opus-1.4\include" "-Isubprojects\opus-1.4\celt" "-I..\subprojects\opus-1.4\celt" "-I..\subprojects\opus-1.4\silk\float" "-I..\subprojects\opus-1.4\silk\fixed" "/MDd" "/nologo" "/showIncludes" "/utf-8" "/W3" "/clang:-std=gnu99" "/Od" "/Zi" "-DOPUS_BUILD" "-DHAVE_CONFIG_H" "-D_CRT_SECURE_NO_WARNINGS" "/Fdsubprojects\opus-1.4\silk\libsilk_sse4_1.a.p\x86_NSQ_sse4_1.c.pdb" /Fosubprojects/opus-1.4/silk/libsilk_sse4_1.a.p/x86_NSQ_sse4_1.c.obj "/c" ../subprojects/opus-1.4/silk/x86/NSQ_sse4_1.c
../subprojects/opus-1.4/silk/x86/NSQ_sse4_1.c(345,22): error: always_inline function '_mm_shuffle_epi8' requires target feature 'ssse3', but would be inlined into function 'silk_noise_shape_quantizer_10_16_sse4_1' that is compiled without support for 'ssse3'
    a_Q12_01234567 = _mm_shuffle_epi8( a_Q12_01234567, xmm_one );
                     ^

https://github.com/mesonbuild/wrapdb/pull/1056

CC @tp-m

Start with subprojects/opus-1.4/silk/x86/NSQ_sse4_1.c and the failing clang-cl command from WrapDB PR #1056. Reproduce the clang-cl CI failure and inspect how the build enables SIMD target features; done means the Opus WrapDB build completes successfully under clang-cl without the reported SSSE3 error.