fix: add missing #include <csignal> in coro_io.hpp

[00fish0]

Why

coro_io.hpp uses std::signal(), SIGPIPE and SIG_IGN (line 769, inside #ifdef linux) but does not include . When no other transitively-included header happens to bring in , compilation fails.

This was discovered while building other library which depends on yalantinglibs. The full error log:

/usr/local/include/ylt/coro_io/coro_io.hpp: In lambda function:
/usr/local/include/ylt/coro_io/coro_io.hpp:769:8: error: 'signal' is not a member of 'std'
  769 |   std::signal(SIGPIPE, SIG_IGN);
      |        ^~~~~~
/usr/local/include/ylt/coro_io/coro_io.hpp:769:15: error: 'SIGPIPE' was not declared in this scope
  769 |   std::signal(SIGPIPE, SIG_IGN);
      |               ^~~~~~~
/usr/local/include/ylt/coro_io/coro_io.hpp:769:24: error: 'SIG_IGN' was not declared in this scope
  769 |   std::signal(SIGPIPE, SIG_IGN);
      |                        ^~~~~~~

The pipe_signal_handler lambda inside #ifdef linux calls std::signal(SIGPIPE, SIG_IGN), which requires . Previously this worked by accident because some other header in the include chain transitively pulled in . When the downstream project's include order differs, this implicit dependency breaks.

What is changing

Add #include to coro_io.hpp.

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Pull request overview

Adds the missing standard header needed for the Linux-only SIGPIPE ignore handler in coro_io.hpp, preventing build failures when <csignal> is not transitively included by other headers.

Changes:

• Include <csignal> in include/ylt/coro_io/coro_io.hpp to support std::signal, SIGPIPE, and SIG_IGN usage under #ifdef __linux__.

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LGTM