small fixes

build.sh

@@ -6,7 +6,9 @@ dotnet build src/lang/Nub.Lang.CLI
 mkdir -p bin-int bin
 rm -rf bin-int/* bin/*
 
-nub example | qbe | as -o bin-int/out.o
+nub example > bin-int/out.ssa
+qbe bin-int/out.ssa > bin-int/out.s
+as -o bin-int/out.o bin-int/out.s
 
 find src/runtime -name '*.s' | while read -r file; do
   as "$file" -o "bin-int/$(basename "${file}" .s).o"