[Bug 223047] lang/rust: unbreak FFI for returning structs on i386

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223047

            Bug ID: 223047
           Summary: lang/rust: unbreak FFI for returning structs on i386
           Product: Ports & Packages
           Version: Latest
          Hardware: i386
                OS: Any
            Status: New
          Keywords: patch, patch-ready
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
            Blocks: 222693
             Flags: merge-quarterly?

Created attachment 187212
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187212&action=edit
v0

Firefox 57 (scheduled on 2017-11-14) is going to enable Stylo by default.
During build Stylo uses rust-bindgen which relies on libclang returning a
struct (e.g., CXString). This seems to corrupt the stack on i386. Let's follow
OpenBSD behavior for now.

MFH to 2017Q4 for Rust 1.19 is desired. I can't do continuous QA for
quarterlies.

FreeBSD 10.3 build logs:
lang/rust   - http://sprunge.us/jEba
www/firefox - http://sprunge.us/OYQf (see -DMOZ_STYLO)

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Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222693
[Bug 222693] www/firefox: update to 57.0
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