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Brad King authored
Refactoring in commit v3.10.0-rc1~103^2~2 (FindMPI: Modernization from ground up, 2017-04-25) accidentally left this variable set as a copy of the `;`-list in `MPI_<LANG>_COMPILE_OPTIONS`, but the flags variable is documented as a command-line string. Restore it now. Fixes: #18349
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