nfs-utils: upgrade 2.6.2 -> 2.6.3

Changelog: http://git.linux-nfs.org/?p=steved/nfs-utils.git;a=shortlog



Three patches were removed as they're now upstream:

2c0b5249 Replace statfs64 with statfs
167f2336 Fix function prototypes
896946e3 mountd: Check for return of stat function

do_compile still failed after removing these patches, reporting
undefined references to 'event_base_new', 'sqlite3_open_v2', etc. This
is fixed by backporting
0001-configure.ac-libevent-and-libsqlite3-checked-when-nf.patch from
upstream.

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>