Code review comment for lp:~epics-core/epics-base/fix-async-dns

Thanks. This branch is intended for merging into 3.14, which doesn't have valgrind/valgrind.h (nor does the 3.15 branch), so my build died:

../ipAddrToAsciiTest.cpp:10:31: fatal error: valgrind/valgrind.h: No such file or directory
 #include <valgrind/valgrind.h>
                               ^
compilation terminated.

However the failure didn't happen until it got to my windows-x64-mingw cross-compile; I got warnings from the VxWorks and RTEMS builds about the missing file, but they still succeeded because it isn't actually necessary to pull in that include file at all. The cleanup() routine is only useful for testing under valgrind, which only runs on Linux, so I just changed the conditional around the call to #ifdef __linux__ and now everything works.

Merging.