libnss: security bump to version 3.39

Fixes the following security issue:

CVE-2018-12384: NSS responded to an SSLv2-compatible ClientHello with a
ServerHello that had an all-zero random.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 1c32e4c298d02ce7ca3c3551be8c31051dde7801)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libnss/libnss.hash

@@ -1,4 +1,4 @@
-# From https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_38_RTM/src/SHA256SUMS
-sha256	2c643d3c08d6935f4d325f40743719b6990aa25a79ec2f8f712c99d086672f62  nss-3.38.tar.gz
+# From https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_39_RTM/src/SHA256SUMS
+sha256	6be64dd76f212415cc8bc34343ac1e7389048db4db9a023a84873c411dc5864b  nss-3.39.tar.gz
 # Locally calculated
 sha256	a20c1a32d1f8102432360b42e932869f7c11c7cdbacf9cac554c422132af47f4  nss/COPYING

package/libnss/libnss.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBNSS_VERSION = 3.38
+LIBNSS_VERSION = 3.39
 LIBNSS_SOURCE = nss-$(LIBNSS_VERSION).tar.gz
 LIBNSS_SITE = https://ftp.mozilla.org/pub/mozilla.org/security/nss/releases/NSS_$(subst .,_,$(LIBNSS_VERSION))_RTM/src
 LIBNSS_DISTDIR = dist