Function blas::c::sgemv

pub fn sgemv(layout: Layout,
             transa: Transpose,
             m: i32,
             n: i32,
             alpha: f32,
             a: &[f32],
             lda: i32,
             x: &[f32],
             incx: i32,
             beta: f32,
             y: &mut [f32],
             incy: i32)