Use fixed hash values when cloning PluginsContrib and ExternalProjectsContrib.

CMake/ctkCheckoutRepo.cmake.in

@@ -11,7 +11,6 @@ ExternalProject_Add(${_NAME}
         PREFIX ep
         GIT_REPOSITORY ${_GIT_PROTOCOL}://${_GIT_URL}
         GIT_TAG ${_GIT_TAG}
-        UPDATE_COMMAND ""
         CONFIGURE_COMMAND ""
         BUILD_COMMAND ""
         INSTALL_COMMAND ""

CMakeLists.txt

@@ -636,7 +636,10 @@ ctk_plugin_option(org.commontk.eventbus
 option(CTK_USE_CONTRIBUTED_PLUGINS OFF "Use CTK plug-ins from the PluginsContrib repository")
 mark_as_advanced(CTK_USE_CONTRIBUTED_PLUGINS)
 if(CTK_USE_CONTRIBUTED_PLUGINS)
-  ctkFunctionAddPluginRepo(NAME PluginsContrib GIT_URL github.com/commontk/PluginsContrib.git)
+  ctkFunctionAddPluginRepo(NAME PluginsContrib
+                           GIT_URL github.com/commontk/PluginsContrib.git
+                           GIT_TAG 7fc37f400c
+                          )
 endif()
 
 #-----------------------------------------------------------------------------
@@ -821,6 +824,7 @@ if(CTK_USE_CONTRIBUTED_PLUGINS)
     ctkFunctionCheckoutRepo(
       NAME ExternalProjectsContrib
       GIT_URL github.com/commontk/ExternalProjectsContrib.git
+      GIT_TAG 97dcdc261b
       )
   endif()