Try to build emscripten static library on macos runner (llvm 19)

Author: mcbarton

.github/workflows/emscripten.yml

@@ -670,8 +670,11 @@ jobs:
                 -DSYSROOT_PATH=$SYSROOT_PATH                     \
                 ../
         fi
-
-        emmake make -j ${{ env.ncpus }} check-cppinterop
+        if [[ "${{ matrix.os }}" == "macos"*  && "${{ matrix.clang-runtime }}" == "19"]]; then
+            EMCC_CORES=2 emmake make 2
+        else
+            emmake make -j ${{ env.ncpus }} check-cppinterop
+        fi
         cd ./unittests/CppInterOp/
         # Fresh install browsers, and run Emscripten tests in them
         # This is to match the Emscripten build instructions, where