rococo fails building

[chevdor]

While testing builds using srtool (cargo build --locked...) for #3354 I could build Kusama, Polkadot, Westend but Rococo failed with the error below.

For the context, this version of srtool uses rust stable 1.53.0 + RUST_BOOTSTRAP=1.

error: cannot find macro `vec` in this scope
   --> /cargo-home/git/checkouts/substrate-7e08433d4c370a21/97338fc/frame/proxy/src/lib.rs:306:56
    |
306 |             let bounded_proxies: BoundedVec<_, T::MaxProxies> = vec![proxy_def]
    |                                                                 ^^^
    |
    = note: consider importing one of these items:
            codec::alloc::vec
            sp_std::vec

error: aborting due to previous error

error: could not compile `pallet-proxy`