ustream-ssl: update to latest git HEAD

e8f9c22 Revise supported ciphersuites
7e9e269 wolfssl, openssl: use TLS 1.3, set ciphersuites

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit ced2b7bb988426aaece07a78c17d5a7c268e54c4)

package/libs/ustream-ssl/Makefile

@@ -5,9 +5,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/ustream-ssl.git
-PKG_SOURCE_DATE:=2019-06-24
-PKG_SOURCE_VERSION:=738e8d2489fc64f782affd1292388c66f6d69e82
-PKG_MIRROR_HASH:=29e69fce0a334746ed3a68d27f5ca5bffbfc144d04329335be47983fdd7cbdfd
+PKG_SOURCE_DATE:=2019-08-17
+PKG_SOURCE_VERSION:=e8f9c22d02fccde1d992f324280fb9966d3b4be6
+PKG_MIRROR_HASH:=b735fc259337c0ea3cc93fc05ad9151b841a8f85a4168f37b1d20979415d5a19
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=ISC