Remove an unnecessary check for parallel and thread-safety from examp…

…les (HDFGroup#4543)

HDF5Examples/CMakeLists.txt

@@ -98,11 +98,11 @@ endif ()
 # Note: Currently CMake only allows configuring of threadsafe on WINDOWS.
 #-----------------------------------------------------------------------------
 option (HDF_ENABLE_THREADSAFE "Enable Threadsafety" OFF)
-if (HDF_ENABLE_THREADSAFE)
-  # check for unsupported options
-  if (HDF_ENABLE_PARALLEL)
-    message (FATAL " **** Parallel and Threadsafe options are mutually exclusive **** ")
-  endif ()
+# Note that HDF_ENABLE_THREADSAFE is the CMake option for determining
+# whether to enable thread-safety in the examples. HDF5_ENABLE_THREADSAFE
+# is the CMake option determining whether HDF5 was configured with
+# thread-safety enabled.
+if (HDF_ENABLE_THREADSAFE AND HDF5_ENABLE_THREADSAFE)
   if (WIN32)
     set (H5_HAVE_WIN_THREADS 1)
     set (H5_HAVE_THREADSAFE 1)