Bug 1250568 - Enable building of TLS 1.3, r=ekr

MozReview-Commit-ID: BPaRVGPK7SR

--HG--
extra : rebase_source : 86dc610f3900e1dad2292d23e52dfb11da23492f

config/external/nss/Makefile.in

@@ -125,6 +125,7 @@ DEFAULT_GMAKE_FLAGS += NSPR_LIB_DIR=$(NSPR_LIB_DIR)
 DEFAULT_GMAKE_FLAGS += MOZILLA_CLIENT=1
 DEFAULT_GMAKE_FLAGS += NO_MDUPDATE=1
 DEFAULT_GMAKE_FLAGS += NSS_ENABLE_ECC=1
+DEFAULT_GMAKE_FLAGS += NSS_ENABLE_TLS_1_3=1
 ifeq ($(OS_ARCH)_$(GNU_CC),WINNT_1)
 DEFAULT_GMAKE_FLAGS += OS_DLLFLAGS='-static-libgcc' NSPR31_LIB_PREFIX=lib
 endif