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FindMPI: Restore MPI_<LANG>_COMPILE_FLAGS as a command-line string

Brad King requested to merge brad.king/cmake:FindMPI-restore-flags-string into master

Refactoring in commit !893 (merged) 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 (closed)

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