Correct #endif syntax... #739

Job	Run time
ubuntu-latest.openmpi.python-3.12	3m 49s
macos-latest.mpich.python-3.12	5m 11s
windows-latest.msmpi.python-3.12	7m 42s
macos-latest.openmpi.python-3.12	3m 33s
ubuntu-latest.mpich.python-3.12	3m 44s
	23m 59s

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