src/poky:rust-llvm: Disable benchmarks by cmake options

Drop patch to exclusively disable it in code
It seems to be fixed upstream [1]

[1] rust-lang/cmake-rs#158

(From OE-Core rev: 60b4b0808a3b961917ed8abe16b9f7df2a311952)

Signed-off-by: Khem Raj <raj.khemgmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briandbootlin.com>
Signed-off-by: Richard Purdie <richard.purdielinuxfoundation.org>

Author: kraj