use rustc-fake as RUSTC_WRAPPER

[csmoe]

1. the 1-feature.patch makes cargo compile-able on OS without openssl pre-installed like osx;
2. RUSTC=rustc_fake makes the build script which depends on Command::new("RUSTC") failed like autocfg

[csmoe]

r? @Kobzol

[Kobzol]

Hi, could you maybe explain a little bit what is the motivation for this change (and what does it even do?)?

[Kobzol]

I'm gonna close this, as it has lingered without a response for a few years. Feel free to reopen if you still want to land it.