hdf5_ep

Merge pull request #884 in HDFFV/hdf5 from ~BYRN/hdf5_adb:develop to develop

* commit 'b57c5490e0901c451a77a356ceb1f6071dc89123':
  JHDFFV-10398 add note
  HDFFV-10398 fix detection of repeat checks
  HDFFV-10398 add support for Emscriptem build system
  HDFFV-10398 avoid sanitizer failures
  HDFFV-10398 - avoid ubsan crashes
  HDFFV-10398 msvc: use /W0 rather than /w
  HDFFV-10398 Suppress VS 2015 assertion failure popup during try_run
  HDFFV-10398 use the target name for custom commands
  HDFFV-10398 use the simpler add_subdirectory signature
  HDFFV-10398 Honor CMAKE_MODULE_PATH when including check modules