PR77661 - Fix: --enable-maintainer-mode causes in-tree-build of MPC to fail

[Tobias Burnus]

Currently, --enable-maintainer-mode causes an in-tree build MPC to fail (cf. PR).
The attached patch fixes this for --enable-maintainer-mode.

OK for the trunk?

Cheers,

Tobias

PS: Thanks to Richard for the suggestion.
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