[Merge] ~mitya57/compiz:lp1882792 into compiz:master

[Dmitry Shachnev]

Dmitry Shachnev has proposed merging ~mitya57/compiz:lp1882792 into compiz:master.

Commit message:
Add support for CMake Unity builds (aka Jumbo builds).

Requested reviews:
  Alberts Muktupāvels (muktupavels)
Related bugs:
  Bug #1882792 in Compiz: "couldn't build as unity build"
  https://bugs.launchpad.net/compiz/+bug/1882792

For more details, see:
https://code.launchpad.net/~mitya57/compiz/+git/compiz/+merge/388842

The first commit adds #ifndef guards to all header files that did not have them (and fixes the existing guard in one more file). This was done semi-automatically.

The second commit sets SKIP_UNITY_BUILD_INCLUSION property on some files that have conflicting function/enums declarations or similar problems.

These two commits together fix CMake Unity builds (LP: #1882792).
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