genimage: Add patch needed for the test on ARM architectures.

* gnu/packages/patches/genimage-signedness.patch: New file.
* gnu/packages/genimage.scm (genimage)[source]: Add patch.
* gnu/local.mk (dist_patch_DATA): Register patch.

gnu/local.mk

@@ -1017,6 +1017,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/gd-brect-bounds.patch			\
   %D%/packages/patches/gdb-hurd.patch				\
   %D%/packages/patches/gdm-default-session.patch		\
+  %D%/packages/patches/genimage-signedness.patch		\
   %D%/packages/patches/geoclue-config.patch			\
   %D%/packages/patches/ghc-8.0-fall-back-to-madv_dontneed.patch	\
   %D%/packages/patches/ghc-testsuite-dlopen-pie.patch		\

gnu/packages/genimage.scm

@@ -50,7 +50,9 @@
               (file-name (string-append name "-" version "-checkout"))
               (sha256
                (base32
-                "15jmh17lvm3jw9c92bjarly7iwhmnfl322d91mprfv10ppb9ip54"))))
+                "15jmh17lvm3jw9c92bjarly7iwhmnfl322d91mprfv10ppb9ip54"))
+              ;; will be shipped with release 14
+              (patches (search-patches "genimage-signedness.patch"))))
     (build-system gnu-build-system)
     (arguments
      `(#:phases

gnu/packages/patches/genimage-signedness.patch

@@ -0,0 +1,24 @@
+commit 6574665f9d6c0757e8f55ccb465afbcaa90bf019
+Author: Timotej Lazar <timotej.lazar@araneo.si>
+Date:   Wed Aug 19 19:36:02 2020 +0200
+
+    test: normalize flags reported by dumpe2fs
+    
+    Filesystem flags depend on the system – usually signed_directory_hash,
+    but unsigned_directory_hash at least on arm64.
+    
+    Signed-off-by: Timotej Lazar <timotej.lazar@araneo.si>
+
+diff --git a/test/basic-images.test b/test/basic-images.test
+index f6685e1..cb104c3 100755
+--- a/test/basic-images.test
++++ b/test/basic-images.test
+@@ -158,6 +158,8 @@ check_ext() {
+ 	# format change
+ 	csum2="Group 0: (Blocks 1-4095) \\[ITABLE_ZEROED\\]\|  Checksum .*, unused inodes 205"
+ 	dumpe2fs "${1}" | grep -v "^\($uuid\|$seed\|$csum1\|$csum2\)" > "dump" &&
++	# some architectures (including arm64) use unsigned char
++	sed -i 's/un\(signed_directory_hash\)/\1/' "dump" &&
+ 	# fixup for ext3 journal size with old tune2fs
+ 	sed -i 's/^\(Journal size:             \)1029k$/\11024k/' "dump" &&
+ 	# output format changed with some version