[Libreoffice] v2 of the configure.in/scp2 patch to allow selecting themes

[Sebastian Spaeth]

This 2nd version also uses defines in the form of
-DTHEME_CRYSTAL that are being used in the scp2 module. Untested,
perhaps someone with a faster compile time than mine can see if the 

--enable-theme="crystal tango" or --enable-theme="" or --enable-theme=""
  (the latter 2 options should enable all themes" options work as
  intended.

This v2 patch needs to be applied together with the other patch to the
packimages module.

Someone also might want to check if I introduced forbidden bashisms. I
never know.

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