xo-XXX -> .xo-XXX (prep subrepo)

xo-callback/src/callback/CMakeLists.txt

@@ -1,14 +0,0 @@
-# callback/CMakeLists.txt
-
-set(SELF_LIB callback)
-#set(SELF_SRCS CallbackSet.cpp)
-
-xo_add_headeronly_library(${SELF_LIB})
-xo_install_library4(${SELF_LIB} ${PROJECT_NAME}Targets)
-
-# ----------------------------------------------------------------
-# external dependencies:
-
-#xo_dependency(${SELF_LIB} refcnt)
-
-# end CMakeLists.txt

xo-callback/src/callback/CallbackSet.cpp

@@ -1,13 +0,0 @@
-/* file CallbackSet.cpp
- *
- * author: Roland Conybeare, Sep 2022
- */
-
-#include "CallbackSet.hpp"
-
-namespace xo {
-    namespace fn {
-    } /*namespace fn*/
-} /*namespace xo*/
-
-/* end CallbackSet.cpp */