Rocket: example/hello_world build fail on `ring v0.11.0`

[chenjianxin]

OS is win10
rustc version is 1.29.0-nightly (874dec25e 2018-07-21)

when I cargo run Rocket/example/hello_world
it return

error: failed to run custom build command for `ring v0.11.0`
process didn't exit successfully: `D:\Rocket\target\debug\build\ring-c911c87736bfc837\build-script-build` (exit code: 101)
--- stderr
thread '<unnamed>' panicked at 'execution failed', D:\.cargo\registry\src\github.com-1ecc6299db9ec823\ring-0.11.0\build.rs:658:9
note: Run with `RUST_BACKTRACE=1` for a backtrace.
thread '<unnamed>' panicked at 'execution failed', D:\.cargo\registry\src\github.com-1ecc6299db9ec823\ring-0.11.0\build.rs:658:9
thread '<unnamed>' panicked at 'execution failed', D:\.cargo\registry\src\github.com-1ecc6299db9ec823\ring-0.11.0\build.rs:658:9
thread '<unnamed>' panicked at 'execution failed', D:\.cargo\registry\src\github.com-1ecc6299db9ec823\ring-0.11.0\build.rs:658:9
thread '<unnamed>' panicked at 'execution failed', D:\.cargo\registry\src\github.com-1ecc6299db9ec823\ring-0.11.0\build.rs:658:9
thread '<unnamed>' panicked at 'execution failed', D:\.cargo\registry\src\github.com-1ecc6299db9ec823\ring-0.11.0\build.rs:658:9

warning: build failed, waiting for other jobs to finish...
error: build failed

[luciusmagn]

Sadly, ring 0.11 still fails to build on Windows. This isn't a Rocket a issue.

[jebrosen]

Duplicate of #457 and/or #642. The next release of Rocket will have ring 0.13 in its dependency chain, which is compiling successfully on Windows.