tdf#161292: Fix create-partial-info for newly added files

084c64982e "Create MAR updates from msi rather
than from archive" had patched make_add_instruction (in
workdir/UnpackedTarball/onlineupdate/tools/update-packagin/common.sh) to
unconditionally use add-if (with the file itself as test file) rather than plain
add (because we can't reuse Mozilla's extension logic there to determine
optional installation parts), and it noted in its commit message that "addition
of files will cause a MAR update to miss them".

Which turned out to be a problem with
<https://update-mar.libreoffice.org/24.2.2.2/LibreOffice_24.2.2.2_Windows_X86_64_d56cc158d8a96260b836f100ef4b4ef25d6f1a01_from_bf759d854b5ab45b6ef0bfd22e51c6dc4fb8b882_partial.mar>,
updating from 24.2.2.1 with instdir/program/python-core-3.8.18/ to 24.2.2.2 with
instdir/program/python-core-3.8.19/:  All the files in python-core-3.8.19 were
recorded as add-if testing on themselves, so were never added.

So a better approach is, for newly added files to make them add (so they get
added unconditionally, even if they are part of some optional component that
happens to not be installed; this hopefully won't cause further issues) instead
of add-if.  (Existing files that are added instead of patched still use add-if,
though.)  This does not address the create-update-info target for full mar
updates (which is not used currently?), just the create-partial-info target.

(The existing calls to make_add_instruction in the upstream Mozilla code already
have a seemingly rotten mix of two-argument calls and calls with three arguments
where the third argument is ignored, and would check for a fourth "forced"
argument but which is never passed in.  So avoid extending that mess further,
and just replace this never-use-add-if call to make_add_instruction directly
with that function's (accordingly tweaked) body.)

Change-Id: Ib596f3aa72c3ab9f896b20f7d623bc574eb15fd8
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/168285
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>
Tested-by: Jenkins

external/onlineupdate/lo.patch

@@ -372,7 +372,13 @@
        fi
      fi
    else
-@@ -270,7 +270,7 @@
+@@ -266,11 +266,12 @@
+   if check_for_add_if_not_update "$f"; then
+     make_add_if_not_instruction "$f" "$updatemanifestv3"
+   else
+-    make_add_instruction "$f" "$updatemanifestv3"
++    verbose_notice "     add \"$f\""
++    echo "add \"$f\"" >> "$updatemanifestv3"
    fi