libsigsegv: fix patch failure of 0004-Add-stack...

After removing the patch 0001-Add-stack... in commit
9863553fe8fa16a4d19f652b409a44bb58ef5567 "packages: all salute the
passing of avr32" the patch 004-Add-stack... does not apply anymore, so
fix it.

Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libsigsegv/0004-Add-stack-direction-for-the-Blackfin-architecture.patch

@@ -19,7 +19,7 @@ index 53f4216..1a97d5a 100644
 @@ -18,6 +18,7 @@ AC_DEFUN([SV_STACK_DIRECTION],
        arc | \
        arm* | strongarm* | xscale* | \
-       avr | avr32 | \
+       avr | \
 +      bfin | \
        c1 | c2 | c32 | c34 | c38 | \
        clipper | \