Rust issues to fix at compile time.

[itdaniher]

"For android, we provide the +v7 feature by default in order to allow
LLVM to lower these 64-bit atomics to actual instructions. If you
compile with -C target-feature=+v7 then it shouldn't make a function
call to __kernel_cmpxchg64."

This should fix the

A newer kernel is required to run this binary. (__kernel_cmpxchg64 helper) Aborted

message we currently get using Luqman's Feb10 build on the RK3188.

[itdaniher]

@luqmana Have you run into this? Any chance you could put another build at http://luqman.ca/rust-builds? Thanks!

[itdaniher]

cross compiling may be resolved with https://github.com/itdaniher/rust/commit/f568720c99d31e55145699ee0c4ecf65099abc40

[itdaniher]

whabamn,