Fix warnings from libraries in x86_64-unknown-redox/lib not being rlibs
Maybe new in a newer toolchain, but prints out WARN rustc_metadata::locator no metadata found: no .rustc section in '/home/coolreader18/.redoxer/toolchain/x86_64-unknown-redox/lib/libstdc++.so.6.0.25' for every crate it compiles