skiboot: fix stringop-truncations

These warnings start to occur under GCC8.

Submitted to upstream skiboot:
https://patchwork.ozlabs.org/patch/1001179/

Change-Id: I2b06e59e23622283c79ad1e25cfac95fdad5d209
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/recipes-bsp/skiboot/skiboot.inc b/recipes-bsp/skiboot/skiboot.inc
index 7ac1c08..ab455b0 100644
--- a/recipes-bsp/skiboot/skiboot.inc
+++ b/recipes-bsp/skiboot/skiboot.inc
@@ -2,6 +2,7 @@
 LICENSE = "Apache-2.0"
 
 SRC_URI += "git://github.com/open-power/skiboot.git"
+SRC_URI += "file://0001-libffs-fix-gcc8-stringop-truncation-warnings.patch"
 
 FILESEXTRAPATHS_append := "${THISDIR}/skiboot:"