made build.sh clean up after itself better

build.sh

@@ -9,3 +9,4 @@ mv target/tinit.lua target/init.lua
 cp -r exec/ service/ lib/ target/
 cp default-init.txt target/cfg/init.txt
 lua finddesc.lua $(find module/ -type f) $(find lib/ -type f) > apidoc.md
+rm target/version.lua