/usr/share/postgresql/10/extension/jsquery.control is in postgresql-10-jsquery 1.0.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # jsquery extension
comment = 'data type for jsonb inspection'
default_version = '1.0'
module_pathname = '$libdir/jsquery'
relocatable = true
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