message: Fix build with the latest Rust compiler.
diff: "os": "none",
  "arch": "x86_64",
  "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
  - "pre-link-args": [ "-m64" ],
  + "pre-link-args": {
  + "gcc": ["-m64"]
  + },
  "cpu": "x86-64",
  "features": "-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-3dnow,-3dnowa,-avx,-avx2,+soft-float",
  "disable-redzone": true,
  