Suppress configure step in CTK-build target

Configuration was done twice since there is an extra
CTK-configure target on which CTK-build depends.

SuperBuild.cmake

@@ -260,6 +260,7 @@ IF(NOT DEFINED SUPERBUILD_EXCLUDE_CTKBUILD_TARGET OR NOT SUPERBUILD_EXCLUDE_CTKB
   SET(proj CTK-build)
   ExternalProject_Add(${proj}
     DOWNLOAD_COMMAND ""
+    CONFIGURE_COMMAND ""
     CMAKE_GENERATOR ${gen}
     SOURCE_DIR ${CTK_SOURCE_DIR}
     BINARY_DIR CTK-build