tests: fix intel/compiler/test_fs_scoreboard.cpp when building on RHEL7 / Amazon Linux 2
Without this change, test_fs_scoreboard.cpp does not compile on GCC 7 due to the use of C99 initializers in a C++ source file.
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Without this change, test_fs_scoreboard.cpp does not compile on GCC 7 due to the use of C99 initializers in a C++ source file.