/usr/share/postgresql/10/extension/mysql_fdw.control is in postgresql-10-mysql-fdw 2.3.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# mysql_fdw.control
# Foreign-data wrapper for remote MySQL servers
#
# Portions Copyright (c) 2012-2014, PostgreSQL Global Development Group
#
# Portions Copyright (c) 2004-2014, EnterpriseDB Corporation.
#
# IDENTIFICATION
# mysql_fdw.control
#
##########################################################################
comment = 'Foreign data wrapper for querying a MySQL server'
default_version = '1.0'
module_pathname = '$libdir/mysql_fdw'
relocatable = true
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