- do not use gb_UnpackedTarball_copy_header_files for boost
- adapt the optimization in concat-deps.c for new path
- use boost_headers in all LinkTargets that require it
- add explicit include paths to mysqlc, mysqlcppconn, libvisio, liborcus

Change-Id: I0c43e73ed43cc9d2e6bce8faf55e992d655a0bb9

Change-Id: I18eaf5596e9ba518672ef041bf6084ef84f608fb

Naming convention for gbuild methods:
- "add" is used for stuff that is logically a part of the target
  (i.e. not registered at the Module, but defined in the target's makefile)
- "use" is used for stuff that is logically a different target
  (i.e. it is registered at the Module, has it's own makefile, may be
  in a different module than the target)

This replaces commits 830a2b92
and 68b08a11 with,
hopefully, proper one.

Kendy's standalone unix-quick-starter, with tweaks to make it
conditionally compiled, and load png images with the new
branding layout from Michael.
Fixes to the soffice shell-script to not run pagein for a 2nd start