[Bug 258837] www/firefox: unbreak llvm=13 build

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258837

            Bug ID: 258837
           Summary: www/firefox: unbreak llvm=13 build
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko@FreeBSD.org
          Reporter: evgeniy@khramtsov.org
                CC: gecko@FreeBSD.org
          Assignee: gecko@FreeBSD.org
             Flags: maintainer-feedback?(gecko@FreeBSD.org)
 Attachment #228314 maintainer-approval?(gecko@FreeBSD.org)
             Flags:
                CC: gecko@FreeBSD.org

Created attachment 228314
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228314&action=edit
v1 (use "git am")

Restore patch-bug1628567 to unbreak glslopt crate build due to cc crate
passing Rust target "x86_64-unknown-freebsd" without OS version to clang++:

[glslopt 0.1.9] cargo:warning=/wrkdirs/usr/ports/www/firefox/work/.build/
ist/system_wrappers/new:3:15: fatal error: 'new' file not found
[glslopt 0.1.9] cargo:warning=#include_next <new>

Build passed on 12.2/amd64 jail with this patch (llvm=13 and llvm=12) and
without (llvm=12). Also, build still passes after forced LTO with llvm=13 via
reverting ports 4e67118c7.

Note, ports llvm still uses base libc++ (bug 215193), so this helps bug 258209
only partly. Upstream bug 1731582 patches might be needed for in base libc++
13:
https://bugzilla.mozilla.org/show_bug.cgi?id=1731582

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