Stop advertising support for compressed points

(We can only write them, not read them.)
diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index a80a769..68f6cae 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -266,13 +266,12 @@
     *p++ = (unsigned char)( ( TLS_EXT_SUPPORTED_POINT_FORMATS      ) & 0xFF );
 
     *p++ = 0x00;
-    *p++ = 3;
-
     *p++ = 2;
-    *p++ = POLARSSL_ECP_PF_COMPRESSED;
+
+    *p++ = 1;
     *p++ = POLARSSL_ECP_PF_UNCOMPRESSED;
 
-    *olen = 7;
+    *olen = 6;
 }
 #endif