Add needed #include.
Per POSIX, WIFSIGNALED and related macros are provided by <sys/wait.h>. Apparently on Linux they're also pulled in by some other inclusions, but BSD-ish systems are pickier. Fixes portability issue in ffa4cbd62. Per buildfarm.
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@ -17,6 +17,7 @@
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#include <ctype.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/inet.h>
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