test714/5: added HTTP as a required feature

These tests use an HTTP proxy so require that curl be built with HTTP
support.
diff --git a/tests/data/test714 b/tests/data/test714
index 9d1f0a9..efec032 100755
--- a/tests/data/test714
+++ b/tests/data/test714
@@ -39,6 +39,9 @@
 ftp
 http-proxy
 </server>
+<features>
+http
+</features>
  <name>
 FTP fetch with --proxy set to http:// and with --connect-to
  </name>
diff --git a/tests/data/test715 b/tests/data/test715
index ffcfc7e..56936b9 100755
--- a/tests/data/test715
+++ b/tests/data/test715
@@ -41,6 +41,9 @@
 http-proxy
 socks5
 </server>
+<features>
+http
+</features>
  <name>
 FTP fetch with --preproxy, --proxy and --connect-to
  </name>