libsigsegv: fix for microblaze

Fixes autobuild failure

http://autobuild.buildroot.net/results/799/799ac378713d82f9632a2aa925223e21157b1042/build-end.log
http://autobuild.buildroot.net/results/ae6/ae6a10ae7cd8f2d2f3891ea9c6e867695ca1acfe/build-end.log
http://autobuild.buildroot.net/results/db4/db48622f6c3a998ecec84ec51f21b4a031ab0fb5/build-end.log



Signed-off-by: Spenser Gilliland <spenser@gillilanding.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>