message: Update MINOR and BUILD_OSS to 28 and 4702.
diff: MAJOR = 2
  -MINOR = 26
  +MINOR = 28
  # BUILD number used for the OSS version.
  -BUILD_OSS = 4695
  +BUILD_OSS = 4702
  # Number to be increased. This value may be replaced by other tools.
  BUILD = BUILD_OSS
  