[CMake] [ANNOUNCE] CMake 3.15.3 available for download

[Robert Maynard]

We are pleased to announce that CMake 3.15.3 is now available for download.

Please use the latest release from our download page:
  https://cmake.org/download/

Thanks for your support!

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Changes in 3.15.3 since 3.15.2:

Brad King (13):
  Flang: Implement MSVC runtime library abstraction
  CTest: Fix --show-only=json-v1 output with REQUIRED_FILES property
  cmGlobalGenerator: Fix CheckCompilerIdCompatibility local var lifetime
  cmAffinity: Add include for CPU_ZERO on Alpine Linux
  find_path: Fix crash on empty old-style list of names
  fileapi: Fix codemodel v2 target file name for CMP0037 OLD behavior
  FindBoost: Simplify conditional block for last known version
  FindBoost: Remove incorrect 1.70 timer dependency
  FindBoost: Unwrap compatibility INTERFACE targets for legacy variables
  FindBoost: Add support for Boost 1.71
  FindBoost: Clarify role of legacy variables in warning message
  FindBoost: Tolerate future Boost INTERFACE libraries
  CMake 3.15.3

Chuck Atkins (1):
  CrayPrgEnv: Change default linking mode based on PE version

M Furkan USLU (1):
  ccmake: handle cache entries with empty STRINGS property

Marvin Schmidt (1):
  libarchive: We now require at least version 3.3.3

Robert Maynard (1):
  FindMPI: Restore MPI_<LANG>_COMPILE_FLAGS and MPI_<LANG>_COMPILE_OPTIONS

Sebastian Holtermann (3):
  Ninja: Add support for ADDITIONAL_CLEAN_FILES in custom targets
  Tests: Extend MakeClean test to test various target types
  Autogen: Fix AUTOUIC segfault, when file includes colliding ui_*.h file