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json_parse_string: Fix handling of multiple backslashes before end quote
Ignore 64-bit time_t warnings in PVS-Studio
Remove hack to support sudo 1.8.7 I/O log timing files
Make SSL_read_ex and SSL_write_ex wrappers set number of bytes on failure.
Call signal_pipe_cb() one a second even if the pipe is empty.
Update embedded copy of zlib to version 1.3.2.