Suppress SIGPIPE when writing to a pipe.#111114
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Add signal(SIGPIPE, SIG_IGN) in OS_Unix::initialize_core() to prevent broken pipe signals from killing the process during headless exports when stdout is piped through commands that close their read end early. Upstream Godot PR godotengine#111114 partially fixed this for FileAccessUnixPipe only — this covers StdLogger::logv() and all other write paths. See: godotengine#111110 Closes: task-634 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Fixes #111110
Note: Not sure if this signal might be used for something else, or we could just do
signal(SIGPIPE, SIG_IGN);on start and ignore it completely.