Revert "e2fsprogs: fix posix_fadvise() signature mismatch"

This reverts commit c3d69016.

The real cause of problem is missing posix_fadvise() implementation in uClibc
for xtensa. This has now been fixed with the uclibc version bump. The internal
e2fsprogs posix_fadvise() implementation is broken on 32bit systems anyway, and
upstream has removed it.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>