Commits on Nov 21, 2018

1. Prepare for being included via crates.io into std …

   This commit prepares the `libc` crate to be included directly into the
   standard library via crates.io. More details about this can be found on
   rust-lang/rust#56092, but the main idea is that this crate now depends
   on core/compiler-builtins explicitly (but off-by-default).
   
   The main caveat here is that this activates `no_core` when building as
   part of libstd, which means that it needs to explicitly have an `iter`
   and `option` module for the expansion of `for` loops to work.

   

   alexcrichton committed Nov 21, 2018
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