README: "quick build": Use "make axtls" after all.

pfalcon · pfalcon · commit 282d81a40e27 · 2016-05-28T21:08:09.000+03:00
"make deplibs" also builds libffi, and that requires GNU autotools. As
we use host libffi by default, skip requiring users to build it for now.
diff --git a/README.md b/README.md
@@ -71,7 +71,7 @@ Alternatively, fallback implementation based on setjmp/longjmp can be used.
 To build (see section below for required dependencies):
 
     $ cd unix
-    $ make deplibs
+    $ make axtls
     $ make
 
 Then to give it a try:
