rblas::matrix_vector::ll::cblas_c::cblas_cgemv

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