gethostbyname2_r is defined in src/pid.cpp and stout/os.hpp

[vinodkone]

../../../3rdparty/libprocess/src/pid.cpp:21:1: warning: "gethostbyname2_r" redefined
In file included from ../../../3rdparty/libprocess/include/process/socket.hpp:10,
                 from ../../../3rdparty/libprocess/include/process/event.hpp:10,
                 from ../../../3rdparty/libprocess/include/process/process.hpp:13,
                 from ../../../3rdparty/libprocess/src/pid.cpp:16:
../../../3rdparty/libprocess/3rdparty/stout/include/stout/os.hpp:57:1: warning: this is the location of the previous definition
mv -f .deps/libprocess_la-latch.Tpo .deps/libprocess_la-latch.Plo