Merge topic 'cpack-deb-post-ops' into release-3.21

805fa791 CPack/DEB: Avoid overriding user-provided `postinst` and `postrm`

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6335

Modules/Internal/CPack/CPackDeb.cmake

@@ -673,7 +673,7 @@ function(cpack_deb_prepare_package_vars)
   if(CPACK_ADD_LDCONFIG_CALL)
     set(CPACK_DEBIAN_GENERATE_POSTINST 1)
     set(CPACK_DEBIAN_GENERATE_POSTRM 1)
-    foreach(f IN LISTS PACKAGE_CONTROL_EXTRA)
+    foreach(f IN LISTS CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA)
       get_filename_component(n "${f}" NAME)
       if(n STREQUAL "postinst")
         set(CPACK_DEBIAN_GENERATE_POSTINST 0)