FindDoxygen: Escape backslashes in default values
Doxygen 1.8.15 added a new LATEX_MAKEINDEX_CMD config item and it has a default value that contains a backslash on some installations.
Fixes: #18738 (closed)
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Doxygen 1.8.15 added a new LATEX_MAKEINDEX_CMD config item and it has a default value that contains a backslash on some installations.
Fixes: #18738 (closed)