Fix build instructions

Author: mcbarton

Emscripten-build-instructions.md

@@ -61,9 +61,9 @@ cd build
 emcmake cmake -DCMAKE_BUILD_TYPE=Release \
                         -DLLVM_HOST_TRIPLE=wasm32-unknown-emscripten \
                         -DLLVM_ENABLE_ASSERTIONS=ON                        \
-                        -DLLVM_TARGETS_TO_BUILD="${{ matrix.llvm_targets_to_build }}" \
+                        -DLLVM_TARGETS_TO_BUILD="WebAssembly" \
                         -DLLVM_ENABLE_LIBEDIT=OFF \
-                        -DLLVM_ENABLE_PROJECTS="${{ matrix.llvm_enable_projects }}" \
+                        -DLLVM_ENABLE_PROJECTS="clang;lld" \
                         -DLLVM_ENABLE_ZSTD=OFF \
                         -DLLVM_ENABLE_LIBXML2=OFF \
                         -DCLANG_ENABLE_STATIC_ANALYZER=OFF \