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These variables in the mingw cross toolchain files no longer mean anything since the line that sets CMAKE_FIND_ROOT_PATH was removed in 14a9eb7.
We were adding the external deps location to both CMAKE_FIND_ROOT_PATH and CMAKE_PREFIX_PATH. Only one is needed. CMAKE_PREFIX_PATH has the weird behavior that if CMAKE_FIND_ROOT_PATH and CMAKE_PREFIX_PATH are both set, each (root path) X (prefix path) pair is considered, and when one isn't a subpath of the other, the search directory that results is formed by concatenating the root path and the prefix path. The deps dir is always an absolute path and not something that we want to be concatenated in the middle, so avoid using CMAKE_PREFIX_PATH. This should make it possible to use CMAKE_FIND_ROOT_PATH in a toolchain file without getting issues from the concatenation behavior, if it turn out to be truly necessary for some toolchain.
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