Compilation fails with clang 4.0

[TheZoq2]

The latest version of clang in the arch repos is 4.0.0-1 and it looks like this crate doesn't build with 4.x

Installing the clang35 package solves the issue but doesn't seem like a permanent solution

Here is the error I get when running running xargo build --release --target thumbv7em-none-eabi

   Compiling teensy3-sys v0.2.0 (file:///home/frans/Documents/rust/teensy/teensy3-rs/teensy3-sys)
error: failed to run custom build command for `teensy3-sys v0.2.0 (file:///home/frans/Documents/rust/teensy/teensy3-rs/teensy3-sys)`
process didn't exit successfully: `/home/frans/Documents/rust/teensy/teensy3-rs-demo/target/release/build/teensy3-sys-8737b26dc3cae50b/build-script-build` (exit code: 101)
--- stdout
cargo:rustc-link-search=native=/home/frans/Documents/rust/teensy/teensy3-rs-demo/target/thumbv7em-none-eabi/release/build/teensy3-sys-c33b386d55ea816e/out
cargo:rustc-link-lib=static=teensyduino

--- stderr
arm-none-eabi-ar: `u' modifier ignored since `D' is the default (see `U')
thread 'main' panicked at 'Unable to find libclang: "the `libclang` shared library could not be opened: /usr/lib/libclang.so"', /checkout/src/libcore/result.rs:859
note: Run with `RUST_BACKTRACE=1` for a backtrace.

make: *** [Makefile:2: build] Error 101

This is after performing the steps needed to get teensy 3.5 compilation working #9