tests: fix intel/compiler/test_fs_scoreboard.cpp build for GCC 7
Without this change, tests cannot be compiled on RedHat 7 / Amazon Linux 2 due to the use of C99 designated initializers in a C++ test file.
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Without this change, tests cannot be compiled on RedHat 7 / Amazon Linux 2 due to the use of C99 designated initializers in a C++ test file.