-Werror,-Wunused-const-variable

Change-Id: I25fa3ea9e0101de7b17c17ef44da6d7b26a46017
(cherry picked from commit 9abd09f04b9a1a3bdde3b24bc03d67319bb25953)
WaE: unused variable 'aService' [loplugin]

Change-Id: Ifc907dad0849f17aec728b9f0e85d44048755a14
(cherry picked from commit 6e0e5503a998b6b0996d1f8013cdd963576b840e)
Get rid of $(share_subdir_name) again

Quoting 56211a166ab25d80de84c2cccce22be15a9be051 "fdo#72394 Don't endlessly
expand $(share_subdir_name) into itself":

* The compile-time variable LIBO_SHARE_FOLDER should not end up as a runtime
  framework path variable, esp. since accidentally re-substituting it for
  "share" segments in unrelated URLs like <file:///export/share/for-all> does
  not make sense.  ac4e19f9085dbd0103c7336a5318aa1e55b3e3e0 "fdo#68552: Don't
  (attempt to) do run-time expansion of build-time parameters" had already
  attempted a fix for that, but it had to be reverted again with
  791a8b96f754798192875da287c84f8cfa4e533e because it "Unfortunately does not
  work if BUILDDIR is different from SRCDIR."

So this time fix it not via configure-expanded *.in files, but via xsltproc
(for officecfg/registry/ files) and sed (for wizards/soruce/configshare files).

The changes to officecfg/util/alllang.xsl will replace @LIBO_SHARE_FOLDER@ only
in oor:name attribues (and in <value> text), not in any other attributes,
because I have no idea how to write that generically in XSLT and it happens to
be only needed in oor:name for now.

Change-Id: Iec78eb70dcbf1a5bbabf4e42f21c44dc65c3e438
(cherry picked from commit 87dd1780a31de9ea1df70a8511c262ff252bf99a)