Set _POSIX_C_SOURCE as we need it for sigemptyset when using muslc

Review Request #2480 — Created June 21, 2023 and submitted — Latest diff uploaded

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pidgin/pidgin
default

Reviewers

muslc requires _POSIX_C_SOURCE to be set to get sigemptyset and a few other
things. I went with 200809L as the value since we're using the C17 standard now
and this is the most recent POSIX version that I could find.

Ran the alpine-edge-amd64 convey plan locally and verified the build was successful.

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