Move ext_inter test sources into encoder group.

ext_inter is no longer behind a flag and is part of
the standard encoder features. Mix the test sources
previously guarded by CONFIG_EXT_INTER into the
base encoder test sources list.

Change-Id: I80312b669b8c8f4a0decc07b64edb6d165905261

test/test.cmake

diff --git a/test/test.cmake b/test/test.cmake
index 256dad9..062a94c 100644
--- a/test/test.cmake
+++ b/test/test.cmake
@@ -219,11 +219,12 @@
         "${AOM_ROOT}/test/av1_fht16x16_test.cc"
         "${AOM_ROOT}/test/av1_fht32x32_test.cc"
         "${AOM_ROOT}/test/av1_fht8x8_test.cc"
-        "${AOM_ROOT}/test/av1_inv_txfm_test.cc"
         "${AOM_ROOT}/test/av1_fwd_txfm1d_test.cc"
         "${AOM_ROOT}/test/av1_fwd_txfm2d_test.cc"
         "${AOM_ROOT}/test/av1_inv_txfm1d_test.cc"
         "${AOM_ROOT}/test/av1_inv_txfm2d_test.cc"
+        "${AOM_ROOT}/test/av1_inv_txfm_test.cc"
+        "${AOM_ROOT}/test/av1_wedge_utils_test.cc"
         "${AOM_ROOT}/test/avg_test.cc"
         "${AOM_ROOT}/test/blend_a64_mask_1d_test.cc"
         "${AOM_ROOT}/test/blend_a64_mask_test.cc"
@@ -231,6 +232,8 @@
         "${AOM_ROOT}/test/fdct4x4_test.cc"
         "${AOM_ROOT}/test/fdct8x8_test.cc"
         "${AOM_ROOT}/test/hadamard_test.cc"
+        "${AOM_ROOT}/test/masked_sad_test.cc"
+        "${AOM_ROOT}/test/masked_variance_test.cc"
         "${AOM_ROOT}/test/minmax_test.cc"
         "${AOM_ROOT}/test/subtract_test.cc"
         "${AOM_ROOT}/test/sum_squares_test.cc"
@@ -255,12 +258,6 @@
       endif ()
     endif ()
 
-      set(AOM_UNIT_TEST_ENCODER_SOURCES
-          ${AOM_UNIT_TEST_ENCODER_SOURCES}
-          "${AOM_ROOT}/test/av1_wedge_utils_test.cc"
-          "${AOM_ROOT}/test/masked_sad_test.cc"
-          "${AOM_ROOT}/test/masked_variance_test.cc")
-
     if (CONFIG_EXT_TX)
       set(AOM_UNIT_TEST_ENCODER_SOURCES
           ${AOM_UNIT_TEST_ENCODER_SOURCES}