Request WASI in webassembly-macos-target preset

Author: MaxDesiatov

utils/build-presets.ini

@@ -2619,6 +2619,7 @@ extra-cmake-options=
     -DWASI_ICU_MD5:STRING="25943864ebbfff15cf5aee8d9d5cc4d7"
     -DSWIFT_PRIMARY_VARIANT_SDK:STRING=WASI
     -DSWIFT_PRIMARY_VARIANT_ARCH:STRING=wasm32
+    -DSWIFT_SDKS='WASI'
     -DSWIFT_OSX_x86_64_ICU_STATICLIB=TRUE
     -DSWIFT_BUILD_SOURCEKIT=FALSE
     -DSWIFT_ENABLE_SOURCEKIT_TESTS=FALSE