contrib: gcrypt: add SHA-256 for GnuTLS

(cherry picked from commit adc154c0cf91cac72b31907acbf400d71e8dd24e)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/gcrypt/rules.mak

@@ -22,8 +22,13 @@ endif
 ifdef HAVE_MACOSX
 CONFIGURE_OPTS += --disable-aesni-support
 endif
+
 .gcrypt: libgcrypt
 	#$(RECONF)
-	cd $< && $(HOSTVARS) ./configure $(HOSTCONF) --enable-ciphers=aes,des,rfc2268,arcfour --enable-digests=sha1,md5,rmd160,sha512 --enable-pubkey-ciphers=dsa,rsa,ecc $(CONFIGURE_OPTS)
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF) \
+		--enable-ciphers=aes,des,rfc2268,arcfour \
+		--enable-digests=sha1,md5,rmd160,sha512 \
+		--enable-pubkey-ciphers=dsa,rsa,ecc \
+		$(CONFIGURE_OPTS)
 	cd $< && $(MAKE) install
 	touch $@