SSP fortification macros

[ASSI]

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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