songmeta is a tool to extract metadata from audio files. It is not intended to support every possible encoding under the sun, but it should strive to support "common" combinations. It could be used in the future in some amused clients to provide metadata-aware functionalities.

reduce the confusion with bufio_write() which does different things, and makes calling it clearer.

after the ev/bufio update amused-web could spin since it didn't detect the EOF.

merge our local changes to bufio though.

Here we have endian.h but also need some other compat shims; the build was failing with an unclear "can't include machine/endian.h". Alter our local endian.h to #include_next endian.h. Then, move the various #define HAVE_* before including any header in config.h since some of the included headers were pulling in endian.h before HAVE_ENDIAN_H is defined.