Fix test compilation with Rust 1.62.0

Rust 1.62.0 now tries to build and run examples for non-exported macros,
as it has been doing with non-public functions. Ignore the tests, as
there is not currently a way to invoke the macros from these examples.

See rust-lang/rust#97030.

src/lib.rs

@@ -47,6 +47,7 @@
 #![recursion_limit = "500"]
 #![deny(unused)]
 #![allow(unused_macros)]
+#![allow(unused_macro_rules)]
 #![cfg_attr(not(feature = "default"), allow(unused_imports))]
 #![deny(unstable_features)]
 #![deny(missing_copy_implementations)]

src/macros.rs

@@ -19,7 +19,7 @@ macro_rules! feature {
 /// The `libc` crate must be in scope with the name `libc`.
 ///
 /// # Example
-/// ```
+/// ```rust,ignore
 /// libc_bitflags!{
 ///     pub struct ProtFlags: libc::c_int {
 ///         PROT_NONE;
@@ -39,7 +39,7 @@ macro_rules! feature {
 /// various flags have different types, so we cast the broken ones to the right
 /// type.
 ///
-/// ```
+/// ```rust,ignore
 /// libc_bitflags!{
 ///     pub struct SaFlags: libc::c_ulong {
 ///         SA_NOCLDSTOP as libc::c_ulong;
@@ -80,7 +80,7 @@ macro_rules! libc_bitflags {
 /// The `libc` crate must be in scope with the name `libc`.
 ///
 /// # Example
-/// ```
+/// ```rust,ignore
 /// libc_enum!{
 ///     pub enum ProtFlags {
 ///         PROT_NONE,