limit symbols exported when using --enable-mergelibs

when doing LTO and --enable-mergelibs, we can improve the effectiveness
of LTO by marking more code as internal to the merged library.

So introduce a new macro UNLESS_MERGELIBS, which we can wrap around
*_DLLPUBLIC annotations

Also introduced here is a script that can be run on a completed build to
determine which classes can be marked with this macro.

Change-Id: I73fb87c897489da53791277d0b66b01f884ba061
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89991
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

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