SSP fortification macros

These seem to be imported from NetBDS, but these crap out when using certain
C99 and up features due to their lack of protecting their arguments, so
this code:

--8<---------------cut here---------------start------------->8---
	memcpy(ed.md5, (unsigned char[]) {
		0xfe, 0xed, 0xfe, 0xed, 0xfe, 0xed, 0xfe, 0xed, 0xfe, 0xed,
		0xfe, 0xed, 0xfe, 0xed, 0xfe, 0xed,
	}, sizeof(ed.md5));
--8<---------------cut here---------------end--------------->8---

will go boom like that:

--8<---------------cut here---------------start------------->8---
/mnt/share/cygpkgs/libarchive/libarchive.x86_64/src/libarchive-3.8.0/libarchive/test/test_write_format_mtree_preset_digests.c: In function ‘test_write_format_mtree_digests_md5_digest_set_no_data’:
/mnt/share/cygpkgs/libarchive/libarchive.x86_64/src/libarchive-3.8.0/libarchive/test/test_write_format_mtree_preset_digests.c:332:26: error: macro "memcpy" passed 19 arguments, but takes just 3
  332 |         }, sizeof(ed.md5));
      |                          ^
In file included from /usr/include/string.h:180,
                 from /mnt/share/cygpkgs/libarchive/libarchive.x86_64/src/libarchive-3.8.0/test_utils/test_common.h:73,
                 from /mnt/share/cygpkgs/libarchive/libarchive.x86_64/src/libarchive-3.8.0/libarchive/test/test.h:42,
                 from /mnt/share/cygpkgs/libarchive/libarchive.x86_64/src/libarchive-3.8.0/libarchive/test/test_write_format_mtree_preset_digests.c:26:
/usr/include/ssp/string.h:97: note: macro "memcpy" defined here
   97 | #define memcpy(dst, src, len) __ssp_bos_check3(memcpy, dst, src, len)
      | 
/mnt/share/cygpkgs/libarchive/libarchive.x86_64/src/libarchive-3.8.0/libarchive/test/test_write_format_mtree_preset_digests.c:329:9: warning: statement with no effect [-Wunused-value]
  329 |         memcpy(ed.md5, (unsigned char[]) {
      |         ^~~~~~
--8<---------------cut here---------------end--------------->8---

If there is a version of these macros compatible with Cygwin that avoids
the issue it would be nice to replace or update them.


Regards,
Achim.
-- 
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