micro_http: gracefully handle EINTR

EINTR errors should not break the HttpServer requests loop,
they are internally consumed and reported as no events rather
than requests errors.

Signed-off-by: Adrian Catangiu <acatan@amazon.com>
Signed-off-by: YUAN LYU <lyuyuan92@gmail.com>

src/lib.rs

@@ -109,6 +109,7 @@
 //! }
 //! ```
 
+extern crate libc;
 extern crate utils;
 
 mod common;