/usr/include/zsh/sigcount.h is in zsh-dev 5.1.1-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | #define SIGCOUNT 31
#define sigmsg(sig) ((sig) <= SIGCOUNT ? sig_msg[sig] : "unknown signal")
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