Fix memory leak in Parse_Date()
Remove gettimeofday and pid_t configure.ac checks
Add a comment about id3_file_fdopen()

Passing a file descriptor to id3_file_fdopen() causes it to take
ownership of the descriptor, so that only a matching id3_file_close() is
required to close the resulting file.

Found with Coverity (CID 1163335).
Remove bogus conditional check in settings parser

Found with Coverity (CID 1163352).
Replace use of stat() in Get_File_Size()

Use g_file_info_get_size() and check for errors, instead of calling
stat(). Rename Get_File_Size() to et_get_file_size().

Found with Coverity (CID 1163369).