Add experimental flag for 4:1 transforms for intra

Change-Id: I64eccc4ce8f2a0f6884bb6f35f4b74ce00b25a30

build/cmake/aom_config_defaults.cmake

diff --git a/build/cmake/aom_config_defaults.cmake b/build/cmake/aom_config_defaults.cmake
index a416933..7d3387d 100644
--- a/build/cmake/aom_config_defaults.cmake
+++ b/build/cmake/aom_config_defaults.cmake
@@ -178,6 +178,7 @@
 set(CONFIG_Q_SEGMENTATION 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_RD_DEBUG 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_RECT_TX_EXT 0 CACHE NUMBER "AV1 experiment flag.")
+set(CONFIG_RECT_TX_EXT_INTRA 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_REFERENCE_BUFFER 1 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_REF_ADAPT 0 CACHE NUMBER "AV1 experiment flag.")
 set(CONFIG_SEGMENT_GLOBALMV 1 CACHE NUMBER "AV1 experiment flag.")

configure

diff --git a/configure b/configure
index 0d44662..fada0c3 100755
--- a/configure
+++ b/configure
@@ -249,6 +249,7 @@
     fp_mb_stats
     cdef_singlepass
     rect_tx_ext
+    rect_tx_ext_intra
     tpl_mv
     short_filter
     dual_filter