[Bug 210890] [exp-run] Define max_align_t for C11 and C++11 in stddef.h

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210890

            Bug ID: 210890
           Summary: [exp-run] Define max_align_t for C11 and C++11 in
                    stddef.h
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: jhb at FreeBSD.org
                CC: freebsd-ports-bugs at FreeBSD.org

Created attachment 172194
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=172194&action=edit
max_align_t.patch

gnu lib wants max_align_t defined by the C compiler.  If it doesn't find one,
it generates its own version which conflicts with the version in libc++'s
stddef.h.  This breaks builds of GDB master on 11.0.  I know dim@ (cc'd) has
worked around this in various ports by forcing max_align_t to be defined via
autoconf.  However, defining max_align_t in C (not just C++) should fix this
for real.

This patch has survived make tinderbox, but I need to see what fallout it has
in ports.  Note that you will need to build a new world with this to get
updated headers.  It does not require a new kernel.

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