CMake: (feature) ROS3 and cmake config file. (#3146)

- Added a cmake variable to the hdf5-config.cmake file which
  indicate if the library has been build with or without the
  read-only S3 functionality.

config/cmake/hdf5-config.cmake.in

@@ -44,6 +44,7 @@ set (${HDF5_PACKAGE_NAME}_ENABLE_PLUGIN_SUPPORT @HDF5_ENABLE_PLUGIN_SUPPORT@)
 set (${HDF5_PACKAGE_NAME}_ENABLE_Z_LIB_SUPPORT @HDF5_ENABLE_Z_LIB_SUPPORT@)
 set (${HDF5_PACKAGE_NAME}_ENABLE_SZIP_SUPPORT  @HDF5_ENABLE_SZIP_SUPPORT@)
 set (${HDF5_PACKAGE_NAME}_ENABLE_SZIP_ENCODING @HDF5_ENABLE_SZIP_ENCODING@)
+set (${HDF5_PACKAGE_NAME}_ENABLE_ROS3_VFD      @HDF5_ENABLE_ROS3_VFD@)
 set (${HDF5_PACKAGE_NAME}_BUILD_SHARED_LIBS    @H5_ENABLE_SHARED_LIB@)
 set (${HDF5_PACKAGE_NAME}_BUILD_STATIC_LIBS    @H5_ENABLE_STATIC_LIB@)
 set (${HDF5_PACKAGE_NAME}_PACKAGE_EXTLIBS      @HDF5_PACKAGE_EXTLIBS@)

release_docs/RELEASE.txt

@@ -163,6 +163,9 @@ New Features
 
       See the CMakeFilters.cmake and config/cmake/cacheinit.cmake files for usage.
 
+    - Added the CMake variable HDF5_ENABLE_ROS3_VFD to the HDF5 CMake config
+      file hdf5-config.cmake. This allows to easily detect if the library
+      has been build with or without read-only S3 functionality.
 
     Library:
     --------