[sparc] <bits/fcntl.h> #define's FFSYNC to undeclared O_FSYNC

The attached program exposes an error in sparc's <bits/fcntl.h> header. It fails to
compile ...

  test_open_flags.c:35: error: ‘O_FSYNC’ undeclared

... because sparc's /usr/include/bits/fcntl.h #defines FFSYNC to O_FSYNC,
but does not supply O_FSYNC. (All the other remapped O_ macros defined in
the group with FFSYNC are supplied e.g. FASYNC to O_ASYNC).

Sparc's <bits/fcntl.h> should not define FFSYNC (or else must define O_FSYNC).

Notes:
 - libexplain is an example of a real-world package which breaks due this.
 - I tested this using the headers from libc6-dev_2.11.1-0ubuntu2_sparc.deb.