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>

package/libsigsegv/libsigsegv-0003-fix-microblaze-build.patch

@@ -0,0 +1,16 @@
+Add microblaze support
+
+Signed-off-by: Spenser Gilliland <spenser@gillilanding.com>
+
+Index: libsigsegv-2.10/m4/stack-direction.m4
+===================================================================
+--- libsigsegv-2.10.orig/m4/stack-direction.m4	2014-01-08 10:15:43.149509801 -0600
++++ libsigsegv-2.10/m4/stack-direction.m4	2014-01-08 10:16:57.249511153 -0600
+@@ -32,6 +32,7 @@
+       m68* | \
+       m88k | \
+       mcore | \
++      microblaze | \
+       mips* | \
+       mmix | \
+       mn10200 | \