Remove some codegen hacks

These were to work around bugs in older compiler revisions.

src/rustup-cli/self_update.rs

@@ -194,11 +194,7 @@ pub fn install(no_prompt: bool, verbose: bool,
                mut opts: InstallOpts) -> Result<()> {
 
     try!(do_pre_install_sanity_checks());
-    // FIXME: #695 This function is miscompiled and crashes.
-    // Even when I pin the compiler to an old nightly, 2016-08-10,
-    // which _does not crash_ on my machine, it still seems to be
-    // miscompiled on the deployed builds. I am very confused.
-    //try!(do_anti_sudo_check(no_prompt));
+    try!(do_anti_sudo_check(no_prompt));
 
     if !no_prompt {
         let ref msg = try!(pre_install_msg(opts.no_modify_path));
@@ -372,7 +368,6 @@ fn do_pre_install_sanity_checks() -> Result<()> {
 #[allow(dead_code)]
 fn do_anti_sudo_check(no_prompt: bool) -> Result<()> {
     #[cfg(unix)]
-    #[inline(never)] // FIXME #679. Mysterious crashes on OS X 10.10+
     pub fn home_mismatch() -> bool {
         extern crate libc as c;