Bring the H5detect removal change from develop (#3648)

* Bring the H5detect removal change from develop

- Removed CMake cross-compiling variables                                    
                                                                             
  * HDF5_USE_PREGEN                                                          
  * HDF5_BATCH_H5DETECT                                                      
                                                                             
  These were used to work around H5detect and H5make_libsettings and         
  are no longer required.                                                    
                                                                             
- Running H5make_libsettings is no longer required for cross-compiling       
                                                                             
  The functionality of H5make_libsettings is now handled via template files, 
  so H5make_libsettings has been removed.                                    
                                                                             
- Running H5detect is no longer required for cross-compiling                 
                                                                             
  The functionality of H5detect is now exercised at library startup,         
  so H5detect has been removed.

* Put H5T_CONV_ab macros in do..while loops (#3432)

Ever since a recent round of macro cleanup, bin/trace and clang-format
have been bickering over what H5Tconv.c should look like and neither
produces readable code.

This change puts the top-level H5T_CONV_ab macros in do..while loops,
adds appropriate semicolons, and adds the missing H5_CLANG_DIAG_ON|OFF
and H5_GCC_CLANG_DIAG_ON|OFF macros to the list of statement macros
clang-format recognizes. H5Tconv.c is now readable and both bin/trace
and clang-format are happy.

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