Function cblas::dspmv

pub unsafe fn dspmv(
    layout: Layout, 
    uplo: Part, 
    n: i32, 
    alpha: f64, 
    ap: &[f64], 
    x: &[f64], 
    incx: i32, 
    beta: f64, 
    y: &mut [f64], 
    incy: i32
)