[Bug 212431] www/firefox: Fix build with libc++ 3.9.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212431

            Bug ID: 212431
           Summary: www/firefox: Fix build with libc++ 3.9.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko at FreeBSD.org
          Reporter: dim at FreeBSD.org
             Flags: maintainer-feedback?(gecko at FreeBSD.org)
          Assignee: gecko at FreeBSD.org

Created attachment 174439
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=174439&action=edit
Patch for mozilla bug 1245076

While testing the clang390-import branch, I ran into issues building Firefox,
which manifest as:

/usr/work/share/dim/ports/www/firefox/work/firefox-47.0.1/obj-i386-portbld-freebsd12.0/dist/include/mozilla/mozalloc.h:184:33:
error: no type named 'bad_alloc' in namespace 'std'
void* operator new(size_t size) MOZALLOC_THROW_BAD_ALLOC
                                ^~~~~~~~~~~~~~~~~~~~~~~~

Jan Beich already reported this in upstream bug 1269171 [1], and it is caused
by the way the Firefox build generates its standard library wrapper headers.

To properly fix this, we need to import the fixes for both upstream bug 1245076
[2] and bug 1269171 [1].  I also had to commit an additional workaround for it
in the clang390-import branch, r305496 [3].

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1269171
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1245076
[3] https://svnweb.freebsd.org/changeset/base/305496

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