Enable rect-tx by default

Change-Id: I51f31083988d7d5c574067c1a3aa98b7949adcee

configure

diff --git a/configure b/configure
index ef22d3a..8b77921 100755
--- a/configure
+++ b/configure
@@ -472,6 +472,7 @@
     soft_enable reference_buffer
     soft_enable delta_q
     soft_enable tile_groups
+    soft_enable rect_tx
 
     # Enable low-bitdepth pixel pipeline by default
     soft_enable lowbitdepth