[source] tools/libressl: Update to 2.5.0 and use mirrors

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/ee7ef227f08946db03569a5e382927877d1a1952

commit ee7ef227f08946db03569a5e382927877d1a1952
Author: Daniel Engberg <daniel.engberg.lists at pyret.net>
AuthorDate: Tue Oct 4 15:21:30 2016 +0200

    tools/libressl: Update to 2.5.0 and use mirrors
    
    Updates LibreSSL to 2.5.0 and switches from main site to mirrors as primary source.
    
    Signed-off-by: Daniel Engberg <daniel.engberg.lists at pyret.net>
---
 tools/libressl/Makefile | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/libressl/Makefile b/tools/libressl/Makefile
index bdf34d3..e1c3cae 100644
--- a/tools/libressl/Makefile
+++ b/tools/libressl/Makefile
@@ -8,12 +8,14 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libressl
-PKG_VERSION:=2.3.4
-PKG_MD5SUM:=b81d990b7eceb156df6eaa7e9f4a353e
+PKG_VERSION:=2.5.0
+PKG_MD5SUM:=8652bf6b55ab51fb37b686a3f604a2643e0e8fde2c56e6a936027d12afda6eae
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=http://ftp.openbsd.org/pub/OpenBSD/LibreSSL/
+PKG_SOURCE_URL:=http://mirror.ox.ac.uk/pub/OpenBSD/LibreSSL \
+	http://ftp.jaist.ac.jp/pub/OpenBSD/LibreSSL \
+	http://ftp.openbsd.org/pub/OpenBSD/LibreSSL
 
 HOST_BUILD_PARALLEL:=1