[gtk3] Add miscellaneous unpackaged files to dist tarball
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examples: Add exampleapp.desktop to dist tarballs
This should fix the last known instance of "MISSING XINCLUDE CONTENT" in the generated documentation when using srcdir != builddir with Autotools.
Fixes: #723 (closed)
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Add miscellaneous unpackaged files to dist tarball
Various files are in git but not in dist tarballs. Some of them look like potentially useful references for downstream distributors.
The second commit can be dropped if unwanted.