audio/id3edit: fix build on BE

sys/_endian.h should probably include sys/types.h:
/wrkdirs/usr/ports/audio/id3edit/work/id3edit-2.2.1/encoding/size.c:25:15: error: use of undeclared identifier 'uint32_t'

25 |     encsize = htobe32(tmp);
   |               ^

/usr/include/sys/_endian.h:119:22: note: expanded from macro 'htobe32'

119 | #define htobe32(x)      ((uint32_t)(x))
    |                           ^

/wrkdirs/usr/ports/audio/id3edit/work/id3edit-2.2.1/encoding/size.c:34:11: error: use of undeclared identifier 'uint32_t'

34 |     tmp = be32toh(encsize);
   |           ^

/usr/include/sys/_endian.h:126:22: note: expanded from macro 'be32toh'

126 | #define be32toh(x)      ((uint32_t)(x))
    |                           ^

2 errors generated.