bsd.own.mk: rename GCC_NO_* to CC_WNO_*

Rename compiler-warning-disable variables from
GCC_NO_warning
to
CC_WNO_warning
where warning is the full warning name as used by the compiler.

GCC_NO_IMPL

bsd.own.mk: rename GCC_NO_* to CC_WNO_*

Rename compiler-warning-disable variables from
GCC_NO_warning
to
CC_WNO_warning
where warning is the full warning name as used by the compiler.

GCC_NO_IMPLICIT_FALLTHRU is CC_WNO_IMPLICIT_FALLTHROUGH

Using the convention CC_compilerflag, where compilerflag
is based on the full compiler flag name.

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Handle OpenSSH-3.x

Redo the sshsk_sign() stuff properly, but putting the helper in libssh.so

Merge conflicts

introduce some common variables for use in GCC warning disables:

GCC_NO_FORMAT_TRUNCATION -Wno-format-truncation (GCC 7/8)
GCC_NO_STRINGOP_TRUNCATION -Wno-stringop-truncation (GCC 8)
GCC_NO_STRI

introduce some common variables for use in GCC warning disables:

GCC_NO_FORMAT_TRUNCATION -Wno-format-truncation (GCC 7/8)
GCC_NO_STRINGOP_TRUNCATION -Wno-stringop-truncation (GCC 8)
GCC_NO_STRINGOP_OVERFLOW -Wno-stringop-overflow (GCC 8)
GCC_NO_CAST_FUNCTION_TYPE -Wno-cast-function-type (GCC 8)

use these to turn off warnings for most GCC-8 complaints. many
of these are false positives, most of the real bugs are already
commited, or are yet to come.


we plan to introduce versions of (some?) of these that use the
"-Wno-error=" form, which still displays the warnings but does
not make it an error, and all of the above will be re-considered
as either being "fix me" (warning still displayed) or "warning
is wrong."

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Updated custom makefiles for OpenSSH 5.6

Merge in our changes:
- conditionalize login_cap
- conditionalize bsd_auth
- bring in pam from portable
- restore krb5, krb4, afs, skey
- bring in hpn patches, disable mt aes cipher, keep speedups an

Merge in our changes:
- conditionalize login_cap
- conditionalize bsd_auth
- bring in pam from portable
- restore krb5, krb4, afs, skey
- bring in hpn patches, disable mt aes cipher, keep speedups and cipher none
- add ignore root rhosts option
- fix ctype macro arguments
- umac is broken, disable it
- better ~homedir handling
- netbsd style tunnels
- urandom, xhome, chrootdir, rescuedir NetBSD handling
- utmp/utmpx handling
- handle tty posix_vdisable properly
- handle setuid and unsetuid the posix way instead of setresuid()
- add all missing functions
- add new moduli
- add build glue

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