CTest: Create scope to isolate defaults for DartConfiguration.tcl

Modules/CTestTargets.cmake

@@ -20,15 +20,17 @@ mark_as_advanced(CMAKE_CTEST_COMMAND)
 # Use CTest
 # configure files
 
-if(CTEST_NEW_FORMAT)
-  configure_file(
-    ${CMAKE_ROOT}/Modules/DartConfiguration.tcl.in
-    ${PROJECT_BINARY_DIR}/CTestConfiguration.ini )
-else()
-  configure_file(
-    ${CMAKE_ROOT}/Modules/DartConfiguration.tcl.in
-    ${PROJECT_BINARY_DIR}/DartConfiguration.tcl )
-endif()
+block()
+  if(CTEST_NEW_FORMAT)
+    configure_file(
+      ${CMAKE_ROOT}/Modules/DartConfiguration.tcl.in
+      ${PROJECT_BINARY_DIR}/CTestConfiguration.ini )
+  else()
+    configure_file(
+      ${CMAKE_ROOT}/Modules/DartConfiguration.tcl.in
+      ${PROJECT_BINARY_DIR}/DartConfiguration.tcl )
+  endif()
+endblock()
 
 #
 # Section 3: