build: remove obsoleted XOPEN/POSIX define as we are using C99
build: remove obsoleted XOPEN/POSIX define as we are using C99

Compiler or options invalid for pre-UNIX 03 X/Open applications
and pre-2001 POSIX applications in Solaris 10


git-svn-id: 27e0aca8c7a52a9ae65dfba2e16879604119af8c@1315 93a4e39c-3214-0410-bb16-828d8e3bcd0f

fastly/ganglia,fastly/ganglia,fastly/ganglia,fastly/ganglia,fastly/ganglia