hdf5: don't let cdash mistake warnings for errors

Projects/hdf5.cmake

@@ -12,4 +12,6 @@ add_external_project(
     -DHDF5_ENABLE_SZIP_ENCODING:BOOL=TRUE
     -DHDF5_BUILD_HL_LIB:BOOL=TRUE
     -DHDF5_BUILD_WITH_INSTALL_NAME:BOOL=TRUE
+
+  LOG_BUILD 1
 )

Projects/win32/hdf5.cmake

@@ -9,6 +9,8 @@ add_external_project(
     -DHDF5_ENABLE_SZIP_SUPPORT:BOOL=TRUE
     -DHDF5_ENABLE_SZIP_ENCODING:BOOL=TRUE
     -DHDF5_BUILD_HL_LIB:BOOL=TRUE
+
+  LOG_BUILD 1
 )
 
 if (MSVC)