changed compiler from tcc to cc since most people do not have tcc changed compiler flags to check for c99 fixed mistake of not including main .c-file for compilation

checkid3v1 now only checks for "TAG" instead of also checking for "TAG+" since "TAG+" is an enhanced tag placed _before_ the id3v1 tag, not replacing it.

empty the buffer the temporary music information is stored in to prevent corrupted text. this only has to be done when less bytes are read than before since otherwise these will only be overwritten.