Avoid using deprecated header file boost/test/auto_unit_test.hpp

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Build Error Description

Note: it's a warning but not an error.
See https://github.com/bitshares/bitshares-core/runs/2409527984 :

2021-04-22T12:15:00.7743943Z In file included from /usr/include/boost/config/header_deprecated.hpp:18,
2021-04-22T12:15:00.7750075Z from /usr/include/boost/test/auto_unit_test.hpp:16,
2021-04-22T12:15:00.7751895Z from /home/runner/work/bitshares-core/bitshares-core/tests/performance/genesis_allocation.cpp:31:
2021-04-22T12:15:00.7758098Z /usr/include/boost/test/auto_unit_test.hpp:17:1: note: #pragma message: This header is deprecated. Use This header is deprecated. Please use <boost/test/unit_test.hpp> instead. instead.
2021-04-22T12:15:00.7759473Z 17 | BOOST_HEADER_DEPRECATED( "This header is deprecated. Please use <boost/test/unit_test.hpp> instead." )
2021-04-22T12:15:00.7763748Z | ^~~~~~~~~~~~~~~~~~~~~~~

Build Environment
Details about the build environment, including the relevant required libraries. Much of this information can be found in the CMakeFiles/CMakeOutput.log.

• Host OS: Ubuntu 20.04
• Host Physical RAM: -
• Source Branch/Tag: develop
• OpenSSL Version: 1.1.1f
• Boost Version: 1.71
• C++ Compiler: GCC

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Fixed by #2415.