rblas::matrix_vector::ll::cblas_d::cblas_dgbmv

pub unsafe extern fn cblas_dgbmv(order: Order, trans: Transpose, m: c_int, n: c_int, kl: c_int, ku: c_int, alpha: c_double, a: *const c_double, lda: c_int, x: *const c_double, inc_x: c_int, beta: c_double, y: *mut c_double, inc_y: c_int)