[Bug 208175] security/gnutls: Rename max_align_t definition conflicting with libc++

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208175

            Bug ID: 208175
           Summary: security/gnutls: Rename max_align_t definition
                    conflicting with libc++
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: bdrewery at FreeBSD.org
          Reporter: dim at FreeBSD.org
             Flags: maintainer-feedback?(bdrewery at FreeBSD.org)
          Assignee: bdrewery at FreeBSD.org

Created attachment 168448
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168448&action=edit
Rename conflicting max_align_t definition

In bug 208158, I asked for an exp-run with updated libc++.  It turns out that
security/gnutls attempts to redefine max_align_t, which is also present in
libc++'s copy of stddef.h, and this conflicts.

Since gnutls doesn't really use the type at all, I thought it was easiest to
simply rename the type to gnu_max_align_t.  This avoids any compilation errors
of C++ sources in gnutls.

Alternatively, the whole block defining max_align_t could be deleted, but that
is a more invasive change, and I don't know how the configure script will
handle that...

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