libsodium: bump to version 1.0.16

Add pgp signature reference.

Cc: Frank Hunleth <fhunleth@troodon-software.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libsodium/libsodium.hash

@@ -1,3 +1,4 @@
 # Locally calculated after checking pgp signature
-sha256 fb6a9e879a2f674592e4328c5d9f79f082405ee4bb05cb6e679b90afe9e178f4  libsodium-1.0.15.tar.gz
+# https://download.libsodium.org/libsodium/releases/libsodium-1.0.16.tar.gz.sig
+sha256 eeadc7e1e1bcef09680fb4837d448fbdf57224978f865ac1c16745868fbd0533  libsodium-1.0.16.tar.gz
 sha256 6faf327c97dca6da69acefc6d3969d7bffb70a24f0707874870fdcfd6b0acf58  LICENSE

package/libsodium/libsodium.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBSODIUM_VERSION = 1.0.15
+LIBSODIUM_VERSION = 1.0.16
 LIBSODIUM_SITE = https://github.com/jedisct1/libsodium/releases/download/$(LIBSODIUM_VERSION)
 LIBSODIUM_LICENSE = ISC
 LIBSODIUM_LICENSE_FILES = LICENSE