message: [Build] Bump master to 4.0.99
  Now that 4.0.0 has been branched off (and tagged), bump the version on
  master.
diff: dnl require autoconf 2.60 (AS_ECHO/AS_ECHO_N)
  AC_PREREQ([2.60])
  -define(_CLIENT_VERSION_MAJOR, 3)
  -define(_CLIENT_VERSION_MINOR, 4)
  +define(_CLIENT_VERSION_MAJOR, 4)
  +define(_CLIENT_VERSION_MINOR, 0)
  define(_CLIENT_VERSION_REVISION, 99)
  define(_CLIENT_VERSION_BUILD, 0)
  define(_CLIENT_VERSION_RC, 0)
  