DragonFlyBSD/src f1a1816. Makefile_upgrade.inc, include err.h

Remove any remaining traces of varargs.h.

This is a follow-up of b3a17fb68c15a4c57da6867f1b2119587b7a68a8.
DeltaFile
+0-77sys/cpu/x86_64/include/varargs.h
+4-5include/err.h
+4-5sys/sys/syslog.h
+1-5share/man/man3/stdarg.3
+3-0Makefile_upgrade.inc
+1-1share/man/man3/Makefile
+13-936 files

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