Merge branch 'bugfix/DuneMPI-spaces-around-LINK_FLAGS' into 'master'

Ansgar Burchardtrequested to merge
cherry-pick-162f8dea into releases/2.6

DuneMPI: add spaces around linker flags

See merge request !503 (merged)

(cherry picked from commit 162f8dea)

2c9a2c84 DuneMPI: add spaces around linker flags

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