* cmake: Add GGML_BACKEND_DIR option This can be used by distributions to specify where to look for backends when ggml is built with GGML_BACKEND_DL=ON. * Fix phrasing
* cmake: Add GGML_BACKEND_DIR option This can be used by distributions to specify where to look for backends when ggml is built with GGML_BACKEND_DL=ON. * Fix phrasing