contrib: bump libressl version to fix multiple definitions

Change-Id: I6f66fa33865f16f9c687bd6419a3428908d454b8

contrib/src/libressl/SHA512SUMS

-f177ba77d6f1ec6e7d843325997e86ad86b309e3e7aa495a7c0960d97ef838690d78c8200077b08e6f430bf007b28949453e5515f788de19fbcc97057560385f  portable-190bd346e75575b9436a2e9e14b28618f0234e1b.tar.gz
+e341dbce8ef3e3314a0734918e83d74f6e8f36a0b84e63dde8d3e6fda0205745ba233527339cc065da644d5f784c44aa09c56ef952f0f7de5f2f14c09016a89e  portable-0974145a9e62d844b5b159cddbce36552bca30df.tar.gz

contrib/src/libressl/rules.mak

@@ -19,8 +19,8 @@
 #  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
 #
 
-LIBRESSL_VERSION := 190bd346e75575b9436a2e9e14b28618f0234e1b
-OPENBSD_VERSION := OPENBSD_6_2
+LIBRESSL_VERSION := 0974145a9e62d844b5b159cddbce36552bca30df
+OPENBSD_VERSION := OPENBSD_6_3
 LIBRESSL_URL := https://github.com/libressl-portable/portable/archive/$(LIBRESSL_VERSION).tar.gz
 OPENBSD_URL := https://github.com/libressl-portable/openbsd/archive/$(OPENBSD_VERSION).tar.gz