packages/cloud-hypervisor: fix build

This supresses the `missing_docs` lint which breaks compilation on Rust 1.83.0+.

packages/by-name/microsoft/cloud-hypervisor/0001-snp-fix-panic-when-rejecting-extended-guest-report.patch

@@ -23,6 +23,5 @@ index f60d8ceb..b8fccf31 100644
                                      self.fd
                                          .gpa_write(&mut swei2_rw_gpa_arg)
                                          .map_err(|e| cpu::HypervisorCpuError::GpaWrite(e.into()))?;
--- 
+--
 2.45.2
-

packages/by-name/microsoft/cloud-hypervisor/0002-hypervisor-mshv-implement-extended-guest-requests-wi.patch

@@ -120,6 +120,5 @@ index 307326dd..69b12364 100644
 +pub const GHCB_RBX_OFFSET: u64 = 0x0318;
  pub const GHCB_SW_EXITINFO1_OFFSET: u64 = 0x398;
  pub const GHCB_SW_EXITINFO2_OFFSET: u64 = 0x3A0;
--- 
+--
 2.45.2
-

packages/by-name/microsoft/cloud-hypervisor/package.nix

@@ -39,6 +39,17 @@ rustPlatform.buildRustPackage rec {
     };
   };
 
+  # Allow compilation with Rust 1.83.0, which requires public methods in
+  # test modules to have documentation when the `missing_docs` lint is enabled.
+  # The [Microsoft fork](https://github.com/microsoft/cloud-hypervisor) will
+  # eventually support this, as [upstream](https://github.com/cloud-hypervisor/cloud-hypervisor)
+  # already does.
+  # See: https://github.com/cloud-hypervisor/cloud-hypervisor/issues/6903
+  postPatch = ''
+    substituteInPlace rate_limiter/src/lib.rs \
+      --replace-fail '#![deny(missing_docs)]' ""
+  '';
+
   patches = [
     ./0001-snp-fix-panic-when-rejecting-extended-guest-report.patch
     ./0002-hypervisor-mshv-implement-extended-guest-requests-wi.patch