Genex: update $<TARGET_FILE_BASE_NAME:...>: take care of POSTFIX.
This capability complement MR !3190 (merged) and !3207 (merged) and is also needed to solve issue #18771 (closed).
topic-rename: genex-TARGET_FILE_BASE_NAME-manage-postfix
This capability complement MR !3190 (merged) and !3207 (merged) and is also needed to solve issue #18771 (closed).
topic-rename: genex-TARGET_FILE_BASE_NAME-manage-postfix