COMP: Drop invalid custom commands from HDF5

CMake 3.0 introduces policy CMP0040 to diagnose add_custom_command calls
whose TARGET option names a target that does not exist.  Drop such
unused custom commands from HDF5.

Change-Id: Ic1fc58a3e2f171c35a9c055cdeca7bcc484ff837

ThirdParty/hdf5/vtkhdf5/src/CMakeLists.txt

@@ -604,27 +604,6 @@ ADD_CUSTOM_COMMAND (
     DEPENDS H5make_libsettings
 )
 
-ADD_CUSTOM_COMMAND (
-    TARGET ${HDF5_BINARY_DIR}/H5Edefin.h
-    PRE_BUILD
-    COMMAND ${CMAKE_COMMAND} -E perl ${HDF5_SOURCE_DIR}/bin/make_err ${HDF5_SOURCE_DIR}/src/H5err.txt
-    COMMENT " Creating err headers"
-)
-
-ADD_CUSTOM_COMMAND (
-    TARGET ${HDF5_BINARY_DIR}/H5version.h
-    PRE_BUILD
-    COMMAND ${CMAKE_COMMAND} -E perl ${HDF5_SOURCE_DIR}/bin/make_vers ${HDF5_SOURCE_DIR}/src/H5vers.txt
-    COMMENT " Creating API version macro"
-)
-
-ADD_CUSTOM_COMMAND (
-    TARGET ${HDF5_BINARY_DIR}/H5overflow.h
-    PRE_BUILD
-    COMMAND ${CMAKE_COMMAND} -E perl ${HDF5_SOURCE_DIR}/bin/make_overflow ${HDF5_SOURCE_DIR}/src/H5overflow.txt
-    COMMENT " Creating Assignment overflow macro"
-)
-
 #-----------------------------------------------------------------------------
 # Add H5Tinit source to build - generated by H5Detect/CMake at configure time
 #-----------------------------------------------------------------------------