Fix libmarkdown highlighting support never turning on
I have libmarkdown 2.2.7, which should have code highlight support. However, a bad if check in our CMake never turns it on. Instead, replace it with a if(DEFINED).
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I have libmarkdown 2.2.7, which should have code highlight support. However, a bad if check in our CMake never turns it on. Instead, replace it with a if(DEFINED).