connect libcbor to the build

[emaste]

Summary

Enabling FIDO/U2F in ssh needs this, libfido2, and changes to ssh itself. I will iterate on this in three separate reviews.

[emaste]

Examples (one of each type) of errors from default WARNS:

/usr/home/emaste/src/freebsd-git/main/contrib/libcbor/src/cbor/arrays.h:99:51: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
CBOR_EXPORT cbor_item_t* cbor_new_indefinite_array();
                                                  ^
                                                   void
...
/usr/home/emaste/src/freebsd-git/main/contrib/libcbor/src/cbor/arrays.c:122:14: error: no previous prototype for function 'cbor_new_indefinite_array' [-Werror,-Wmissing-prototypes]
...
/usr/home/emaste/src/freebsd-git/main/contrib/libcbor/src/cbor/arrays.c:122:39: error: this old-style function definition is not preceded by a prototype [-Werror,-Wstrict-prototypes]

/usr/home/emaste/src/freebsd-git/main/contrib/libcbor/src/cbor/arrays.c:23:23: error: cast from 'unsigned char *' to 'cbor_item_t **' (aka 'struct cbor_item_t **') increases required alignment from 1 to 8 [-Werror,-Wcast-align]
  return cbor_incref(((cbor_item_t **)item->data)[index]);
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~

/usr/home/emaste/src/freebsd-git/main/contrib/libcbor/src/cbor/callbacks.c:13:37: error: unused parameter '_ctx' [-Werror,-Wunused-parameter]

/usr/home/emaste/src/freebsd-git/main/contrib/libcbor/src/cbor/streaming.c:101:66: error: missing field 'required' initializer [-Werror,-Wmissing-field-initializers]

[emaste]

lib/libcbor/Makefile

10

I used the NetBSD convention here (DIST) to avoid conflicting with LIBCBORDIR set in src.libnames.mk.

[emaste]

• skip libcbor / libfido2 on compat32 build

[emaste]

lib/Makefile

218

libfido2 is not compatible with the COMPAT_32BIT hack in usb_ioctl.h so I plan to just skip libcbor and libfido2 from lib32 for now - they are PRIVATELIB used only by ssh-sk-helper so need for them anyway

[kevans]

tools/build/mk/OptionalObsoleteFiles.inc

7122

?

[emaste]

tools/build/mk/OptionalObsoleteFiles.inc

7122

ah, should just be deleted - /usr/lib/debug is handled automatically
but should be OLD_LIBS instead

[emaste]

fix up OptionalObsoleteFiles.inc thanks @kevans

[emaste]

tools/build/mk/OptionalObsoleteFiles.inc

7123–7125

As a separate change all of the usr/lib/private/libfoo entries in this file should move to ObsoleteFiles.inc, and be replaced with usr/lib/libprivatefoo in here; I'll pick that up in a bit

See R10:5551c573554e4bb755565098222d0d74fa83e5cb
CC @bapt

[kevans]

I don't see anything else concerning. :-)