MFC r287341,r287342,r287348:

r287341 (by rodrigc):

Use ANSI C prototypes.

Eliminates gcc 4.9 warnings.

r287342 (by rodrigc):

Mark unused parameters to reduce gcc 4.9 warnings.

r287348 (by rodrigc):

Use correct function prototype for signal handler.

Eliminates gcc 4.9 warning.

MFC r278932:
r278932 (by pfg):

libc: clean some set-but-not-used errors.

These were found by gcc 5.0 on Dragonfly BSD, however I
made no attempt to silence the false positives.

Obtained from: DragonFly (cf515c3a6f3a8964ad592e524442bc628f8ed63b)

MFC r258578, r258580, r258581 (by hrs):
Replace Sun RPC license in TI-RPC library with a 3-clause BSD license
with the explicit permissions.

MFC r258578, r258580, r258581 (by hrs):
Replace Sun RPC license in TI-RPC library with a 3-clause BSD license
with the explicit permissions.