add json-c-0.16

zhangzengfei

2023-01-12 f03bf31433d44206d0d44a2f7621d70e0fb67d39

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#!/bin/sh
#
# Doxygen markdown doesn't support triple-backticks like github does.
# Convert all of those to space-prefixed blocks instead.
#
awk '/```/ { prefix=!prefix; print ""; next; } { if (prefix) { printf "    "; } print $0; } ' "$@"