add patch

skiboot-6.6.2-ffspart.patch

@@ -0,0 +1,25 @@
+commit 6278c6df4ff2123725efc10e5e6ea48d02fda55a
+Author: Dan Horák <dan@danny.cz>
+Date:   Mon Aug 10 12:59:04 2020 +0200
+
+    external/ffspart: define $(sbindir) for Makefile
+    
+    Right now the $(sbindir) variable isn't defined, so the binary gets installed
+    directly into $(DESTDIR).
+    
+    Signed-off-by: Dan Horák <dan@danny.cz>
+
+diff --git a/external/ffspart/rules.mk b/external/ffspart/rules.mk
+index 40972c688..e006dc5b7 100644
+--- a/external/ffspart/rules.mk
++++ b/external/ffspart/rules.mk
+@@ -10,6 +10,9 @@ LIBFLASH_SRC := $(addprefix libflash/,$(LIBFLASH_FILES))
+ OBJS	+= $(LIBFLASH_OBJS)
+ OBJS	+= common-arch_flash.o
+ 
++prefix = /usr/local/
++sbindir = $(prefix)/sbin
++
+ CC	= $(CROSS_COMPILE)gcc
+ 
+ FFSPART_VERSION ?= $(shell ./make_version.sh $(EXE))