[PATCH] simplify external module check with macro

Hello LibreOffice gerrit bot, David Tardon,

I'd like you to reexamine a change.  Please visit

    https://gerrit.libreoffice.org/2185

to look at the new patch set (#4).

Change subject: simplify external module check with macro
......................................................................

simplify external module check with macro

- a >12.000 LOC configure.ac is more than enough for everybody
- removing some 100 lines cant hurt
- the SYSTEM_LIBCDR=$SYSTEM_CDR stuff should be removed in a later step,
  by renaming them in the build

Change-Id: I5c065c5c341561258800a124b0fc1f40b3d59211
---
M configure.ac
A m4/libo_externals.m4
2 files changed, 78 insertions(+), 150 deletions(-)


  git pull ssh://gerrit.libreoffice.org:29418/core refs/changes/85/2185/4
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I5c065c5c341561258800a124b0fc1f40b3d59211
Gerrit-PatchSet: 4
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Björn Michaelsen <bjoern.michaelsen@canonical.com>
Gerrit-Reviewer: David Tardon <dtardon@redhat.com>
Gerrit-Reviewer: LibreOffice gerrit bot <gerrit@libreoffice.org>
Gerrit-Reviewer: Mathias M <matm@gmx.fr>