Ignore the CMAKE_INSTALL_PREFIX when searching for assets.

CMake adds the CMAKE_INSTALL_PREFIX and the CMAKE_STAGING_PREFIX variable to the CMAKE_SYSTEM_PREFIX_PATH by default. This variable may be set on the command line to control that behavior.

Set CMAKE_FIND_NO_INSTALL_PREFIX to TRUE to tell find_package not to search in the CMAKE_INSTALL_PREFIX or CMAKE_STAGING_PREFIX by default. Note that the prefix may still be searched for other reasons, such as being the same prefix as the CMake installation, or for being a built-in system prefix.