clangd friendly headers

[GitHub pull_request - opened]

alsa-project/alsa-lib pull request #286 was opened from timblechmann:

quality of life improvements when working with clangd enabled IDEs. these two patches fix issues when clangd parses the headers in isolation in a c++ compile context

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* make headers self-contained
* avoid c++ keyword

Request URL   : https://github.com/alsa-project/alsa-lib/pull/286
Patch URL     : https://github.com/alsa-project/alsa-lib/pull/286.patch
Repository URL: https://github.com/alsa-project/alsa-lib