rustc: disable a test failing on Hydra repeatedly

The problem doesn't happen for me locally, but on Hydra
we tend to experience more flakiness in networking tests.

+3
+3
pkgs/development/compilers/rust/rustc.nix
··· 85 # https://reviews.llvm.org/rL281650 86 rm -vr src/test/run-pass/issue-36474.rs || true 87 88 # Disable some failing gdb tests. Try re-enabling these when gdb 89 # is updated past version 7.12. 90 rm src/test/debuginfo/basic-types-globals.rs
··· 85 # https://reviews.llvm.org/rL281650 86 rm -vr src/test/run-pass/issue-36474.rs || true 87 88 + # On Hydra: `TcpListener::bind(&addr)`: Address already in use (os error 98)' 89 + sed '/^ *fn fast_rebind()/i#[ignore]' -i src/libstd/net/tcp.rs 90 + 91 # Disable some failing gdb tests. Try re-enabling these when gdb 92 # is updated past version 7.12. 93 rm src/test/debuginfo/basic-types-globals.rs