Fix build failure on uclibc with libxcrypt which has been added in
commit 464bbe26ff
Fixes:
- http://autobuild.buildroot.org/results/79a51b0d348e756517b5c9ce815a67f5c657e7e6
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>