doc: warn users that PATCHES may not work properly when CPM_SOURCE_CACHE is unset. #580
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Issue #577 is difficult to debug once triggered given that it is undocumented. It is likely to affect virtually all developers who rely on PATCHES with CPM_SOURCE_CACHE unset. If there is no plan to resolve it quickly, and if the assumption is that the users should set CPM_SOURCE_CACHE when they use PATCHES, then it should be documented as such.