Build subset of included breeze icons
* patches/breeze-icons/subset-crossbuild.patch: Add combined patch for subset and crosscompiling. * src/Makefile.am: Add config flag for breeze-icons. * src/included-icons.txt: New. List of icons we use. * Makefile.am (EXTRA_DIST): Update patch.
This for now just creates the reduced breeze-icons.rcc manually
testing the installation already showed a great speed increase.
- GnuPG-Bug-Id: T6259