Cosmin Truta 3bca02e274 examples: Refactor and reformat using clang-format ...

Add contrib/examples/.clang-format, tailored to fit the existing code
as closely as possible. The end goal is to set up automatic formatting
for the entire libpng source tree. We're doing this experiment in this
subdirectory, for now.

Also make refactoring changes, as follows:

 * Rewrite the preprocessor checks `#if PNG_FOO_SUPPORTED` to stop
   compilation immediately, with a descriptive `#error` about what
   needs to be supported.

 * Rewrite and reflow comments, add braces and brackets, and make other
   minor modifications that are suited for the clang-format'ed code.

2025-06-01 22:40:38 +03:00

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