Motivation: there is no glibc wrapper for this syscall

Signed-off-by: Tom Kirchner <tjk@amazon.com>
Signed-off-by: Ben Cressey <bcressey@amazon.com>

The associated `perf_event_attr` struct is not included as it contains
unions and a bitfield making it unrepresentable in Rust. Additionally,
it is not entirely stable, and has changed size several times.