cargo: build in Cargo's out dir if DENO_BUILD_PATH is not set
Plus some minor improvements and clean-ups: * Resolve DENO_BUILD_PATH to an absolute path if necessary. * Rename DENO_BUILD_PATH to GN_OUT_DIR in places where it is supposed to be set by the build system (and not a user configuration variable). * Output Cargo `rerun-if-*-changed` instructions first, so even if the build itself fails, configuration changes will still trigger a re-run of build.rs. * Remove TODOs that are impossible. * Re-run build.rs when the flatbuffer definition file changes.
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