util-linux: fix link failures due to name clash

Several packages have a similar md5.c file, and each has a function
named byteReverse(). This generates link errors when building
statically ("multiple definition of `byteReverse'").

Fix by applying a patch from upstream.

Fixes:
  http://autobuild.buildroot.net/results/419ab2c0e034cc68991281c51caa8271b0fadbab/



Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Cc: Adam Duskett <aduskett@gmail.com>
Tested-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>