Change ExternalProject prefixes to always match the FetchContent location #315
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FetchContent will download and create the artifact directories in
FETCHCONTENT_BASE_DIR, which defaults to${CMAKE_BINARY_DIR}/_deps. Currently, projects that are still managed by ExternalProject in TiledArray hard code the path${CMAKE_BINARY_DIR}/_depsto be their download/artifact directories. While this doesn't cause a problem for TiledArray on its own, it does create an inconsistency in dependency download locations for projects that pull in TiledArray and set a non-standardFETCHCONTENT_BASE_DIR. This pull request changes the ExternalProject locations to always be consistent with the FetchContent locations.