Merge branch 'force-ctk-inner-project-rebuild'. Fixes commontk#32

* force-ctk-inner-project-rebuild:
  ExternalProject_Add_Step requires COMMAND parameter with VisualStudioi. See commontk#32
  Unconditionally rebuild "CTK-build" inner project. See commontk#32

SuperBuild.cmake

@@ -279,6 +279,15 @@ IF(NOT DEFINED SUPERBUILD_EXCLUDE_CTKBUILD_TARGET OR NOT SUPERBUILD_EXCLUDE_CTKB
     DEPENDS
       "CTK-Configure"
     )
+  # This custom external project step forces the build and later
+  # steps to run whenever a top level build is done...
+  ExternalProject_Add_Step(${proj} forcebuild
+    COMMAND ${CMAKE_COMMAND} -E echo_append ""
+    COMMENT "Forcing build step for '${proj}'"
+    DEPENDEES configure
+    DEPENDERS build
+    ALWAYS 1
+    )
 ENDIF()
 
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