DragonFlyBSD/src b2e7ce7sys/cpu/x86_64/include signal.h, sys/net if_clone.h

#include <sys/cdefs.h> in a number of headers that use macros from it.

All these are public headers and check some kind of __*_VISIBLE macro
with #if but were not making sure that these macros are available and
set correctly.
DeltaFile
+2-0sys/cpu/x86_64/include/signal.h
+2-0sys/net/if_clone.h
+2-0sys/sys/_fd_set.h
+2-0sys/sys/_termios.h
+8-04 files

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