Sergei Trofimovich 664464a5dd libburn: backport upstream C23 fix
Without the change the build against c23 compiler (like `gcc-15`) fails as:

    libburn> test/poll.c: In function 'main':
    libburn> test/poll.c:67:27: error: assignment to '__sighandler_t' {aka 'void (*)(int)'} from incompatible pointer type 'void (*)(void)' []
    libburn>    67 |         newact.sa_handler = catch_int;
    libburn>       |                           ^
2025-01-26 22:22:45 +00:00
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