contrib: update gnutls to 3.8.0

Change-Id: Icf4b00ad351dc2f1e9acfc59e1e2b33bf5461b44

contrib/src/gnutls/SHA512SUMS

-f872339df80ec31d292821ff00eaafbe50e0bd4cdbb86e21e4f78541cd0a26d843596d5e69c91de4db8ce7d027fc639ae6462b57d89fb116162ae63c5a97486a  gnutls-3.7.6.tar.xz
+2507b3133423fdaf90fbd826ccb1142e9ff6fc90fcd5531720218f19ddf0e6bbb8267d23bad35c0954860e5a4179da74823e0c8357db56a14f252e6ec9d59629  gnutls-3.8.0.tar.xz

contrib/src/gnutls/rules.mak

 # GnuTLS
 
-GNUTLS_VERSION := 3.7.6
-GNUTLS_URL := https://www.gnupg.org/ftp/gcrypt/gnutls/v3.7/gnutls-$(GNUTLS_VERSION).tar.xz
+GNUTLS_VERSION := 3.8.0
+GNUTLS_URL := https://www.gnupg.org/ftp/gcrypt/gnutls/v3.8/gnutls-$(GNUTLS_VERSION).tar.xz
 
 PKGS += gnutls
 
@@ -18,7 +18,7 @@ $(TARBALLS)/gnutls-$(GNUTLS_VERSION).tar.xz:
 
 gnutls: gnutls-$(GNUTLS_VERSION).tar.xz .sum-gnutls
 	$(UNPACK)
-	$(APPLY) $(SRC)/gnutls/0001-m4-remove-malloc-realloc.patch
+#	$(APPLY) $(SRC)/gnutls/0001-m4-remove-malloc-realloc.patch
 ifndef HAVE_IOS
 	$(APPLY) $(SRC)/gnutls/mac-keychain-lookup.patch
 endif
@@ -27,6 +27,7 @@ endif
 	$(MOVE)
 
 GNUTLS_CONF := \
+    --enable-heartbeat-support \
 	--disable-gtk-doc \
 	--without-p11-kit \
 	--disable-cxx \