Updates version number to 0.4.259802971.20190724.
Updates version number to 0.4.259802971.20190724.

Significant changes:
- `c++11` is now the default for the CLANG_CXX_LANGUAGE_STANDARD
  Xcode build setting, which may lead to indexing improvements.
  Updates options list to match Xcode 10.2.1 and Xcode 11
  settings.

PiperOrigin-RevId: 259806900

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