linux-cross: fix the `arm-linux-gnueabihf` toolchain
linux-cross: fix the `arm-linux-gnueabihf` toolchain

The toolchain fails to build with the current settings. This PR adjusts them to make the toolchain
buildable again.

rust-lang/rust-buildbot,rust-lang/rust-buildbot,rust-lang/rust-buildbot,rust-lang-deprecated/rust-buildbot,rust-lang-deprecated/rust-buildbot,rust-lang-deprecated/rust-buildbot