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libc: Supress warning in sys.h

_sigaction() prototype was using struct sigaction that it is not
defined in the file which leads to a definition only valid in
the context of the own prototype. A forward declaration is added
to avoid it.

--- a/include/bits/dragonfly/sys.h

+++ b/include/bits/dragonfly/sys.h

@@ -18,6 +18,8 @@

 typedef int pid_t;

+struct sigaction;

+

 extern int _fork(void);

 extern pid_t _getpid(void);

 extern int _kill(pid_t, int);

--- a/include/bits/netbsd/sys.h

+++ b/include/bits/netbsd/sys.h

@@ -18,6 +18,8 @@

 typedef int pid_t;

+struct sigaction;

+

 extern int _fork(void);

 extern pid_t _getpid(void);

 extern int _kill(pid_t, int);