package/libnss: fix build failure on microblaze

By mistake seed.o has been added to public library too, but this way its
dependencies are not taken into account(stubs.o), this way build fails
complaining on missing functions from stubs.o file. Let's fix it by
adding upstream patch:
f46fca8ced

Fixes:
http://autobuild.buildroot.net/results/4cb/4cbf4c35549a3bfba06222ba509d0263f23a3a2e/

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libnss/0003-Bug-1642146-Move-seed.o-back-into-freeblpriv3.-r-bbe.patch

@@ -0,0 +1,50 @@
+From 0841ebe3c85bfb12ecf080efb2e28ac18f55ed41 Mon Sep 17 00:00:00 2001
+From: Mike Hommey <mh@glandium.org>
+Date: Mon, 15 Jun 2020 18:12:09 +0000
+Subject: [PATCH] Bug 1642146 - Move seed.o back into freeblpriv3.
+ r=bbeurdouche
+
+Differential Revision: https://phabricator.services.mozilla.com/D77595
+
+--HG--
+extra : moz-landing-system : lando
+
+Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
+---
+ nss/lib/freebl/Makefile    | 4 ----
+ nss/lib/freebl/manifest.mn | 4 ++++
+ 2 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/nss/lib/freebl/Makefile b/nss/lib/freebl/Makefile
+index 29dc940a3..52d827c6a 100644
+--- a/nss/lib/freebl/Makefile
++++ b/nss/lib/freebl/Makefile
+@@ -545,10 +545,6 @@ ifndef HAVE_INT128_SUPPORT
+     DEFINES += -DKRML_VERIFIED_UINT128
+ endif
+ 
+-ifndef NSS_DISABLE_DEPRECATED_SEED
+-	CSRCS += deprecated/seed.c
+-endif
+-
+ ifndef NSS_DISABLE_CHACHAPOLY
+     ifeq ($(CPU_ARCH),x86_64)
+         ifndef NSS_DISABLE_AVX2
+diff --git a/nss/lib/freebl/manifest.mn b/nss/lib/freebl/manifest.mn
+index 5efb48520..8dd8ddb53 100644
+--- a/nss/lib/freebl/manifest.mn
++++ b/nss/lib/freebl/manifest.mn
+@@ -160,6 +160,10 @@ CSRCS = \
+ 	$(EXTRA_SRCS) \
+ 	$(NULL)
+ 
++ifndef NSS_DISABLE_DEPRECATED_SEED
++	CSRCS += deprecated/seed.c
++endif
++
+ ALL_CSRCS := $(CSRCS)
+ 
+ ALL_HDRS =  \
+-- 
+2.25.1
+