makefile: use llvm-config to add include and libdirs
makefile: use llvm-config to add include and libdirs

WebAssembly/wasm-to-llvm-prototype,WebAssembly/wasm-to-llvm-prototype,mildred/wasm-to-llvm-prototype,WebAssembly/wasm-to-llvm-prototype,mildred/wasm-to-llvm-prototype,mildred/wasm-to-llvm-prototype