Do not build lld on Windows.

build.sh

@@ -13,14 +13,33 @@ else
 fi
 rm llvm-project-$version.src.tar*
 
+cmake_flags=(
+    -DCMAKE_INSTALL_PREFIX="$PWD/../install"
+    -DCMAKE_BUILD_TYPE=Release
+    -DLLVM_ENABLE_TERMINFO=OFF
+    -DLLVM_ENABLE_LIBEDIT=OFF
+    -DLLVM_ENABLE_ZLIB=OFF
+    -DLLVM_ENABLE_ZSTD=OFF
+    -DLLVM_ENABLE_LIBXML2=OFF
+    -DLLVM_ENABLE_ASSERTIONS=OFF
+)
+
 mkdir build install
 cd build
 if [[ $(uname) = MINGW* ]]; then
     export CMAKE_GENERATOR="Visual Studio 17 2022"
     export CMAKE_GENERATOR_PLATFORM=x64
     export CMAKE_GENERATOR_TOOLSET="host=x64"
+    cmake_flags+=(
+        -DLLVM_ENABLE_PROJECTS=clang
+    )
+else
+    cmake_flags+=(
+        -DLLVM_ENABLE_PROJECTS='clang;lld'
+        -DLLVM_ENABLE_RUNTIMES=libunwind
+    )
 fi
-cmake ../llvm-project-$version.src/llvm -DCMAKE_INSTALL_PREFIX=$PWD/../install -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS='clang;lld' -DLLVM_ENABLE_RUNTIMES=libunwind -DLLVM_ENABLE_TERMINFO=OFF -DLLVM_ENABLE_LIBEDIT=OFF -DLLVM_ENABLE_ZLIB=OFF -DLLVM_ENABLE_ZSTD=OFF -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_ENABLE_ASSERTIONS=OFF
+cmake ../llvm-project-$version.src/llvm "${cmake_flags[@]}"
 if [[ $(uname) = MINGW* ]]; then
     cmake --build . --target INSTALL --config Release -j${threads:-4}
 else