MINOR: httpclient: cleanup the include files

Include the correct .h files in http_client.c and http_client.h.

The api.h is needed in http_client.c and http_client-t.h is now include
directly from http_client.h
diff --git a/include/haproxy/http_client.h b/include/haproxy/http_client.h
index 2f507dd..a34b3cd 100644
--- a/include/haproxy/http_client.h
+++ b/include/haproxy/http_client.h
@@ -1,6 +1,8 @@
 #ifndef _HAPROXY_HTTPCLIENT_H
 #define _HAPROXY_HTTPCLIENT_H
 
+#include <haproxy/http_client-t.h>
+
 void httpclient_destroy(struct httpclient *hc);
 struct httpclient *httpclient_new(void *caller, enum http_meth_t meth, struct ist url);
 
diff --git a/src/http_client.c b/src/http_client.c
index 257c2c0..582348f 100644
--- a/src/http_client.c
+++ b/src/http_client.c
@@ -11,10 +11,8 @@
  * This file implements an HTTP Client API.
  *
  */
-#include <haproxy/connection-t.h>
-#include <haproxy/http_client-t.h>
-#include <haproxy/server-t.h>
 
+#include <haproxy/api.h>
 #include <haproxy/applet.h>
 #include <haproxy/cli.h>
 #include <haproxy/dynbuf.h>
@@ -28,6 +26,7 @@
 #include <haproxy/htx.h>
 #include <haproxy/log.h>
 #include <haproxy/proxy.h>
+#include <haproxy/server.h>
 #include <haproxy/stream_interface.h>
 #include <haproxy/tools.h>