vp9_end_to_end_test: enable in vp10-only builds

this file is shared between vp9 & vp10; this makes it available in the
presence of --disable-vp9

BUG=webm:1235

Change-Id: Iaf060c3c09afd2c7df69995b0c01589f78d4945e
diff --git a/test/test.mk b/test/test.mk
index 9a87a80..ee5241a 100644
--- a/test/test.mk
+++ b/test/test.mk
@@ -42,7 +42,6 @@
 LIBVPX_TEST_SRCS-$(CONFIG_VP9_ENCODER) += cpu_speed_test.cc
 LIBVPX_TEST_SRCS-$(CONFIG_VP9_ENCODER) += frame_size_tests.cc
 LIBVPX_TEST_SRCS-$(CONFIG_VP9_ENCODER) += vp9_lossless_test.cc
-LIBVPX_TEST_SRCS-$(CONFIG_VP9_ENCODER) += vp9_end_to_end_test.cc
 LIBVPX_TEST_SRCS-$(CONFIG_VP9_ENCODER) += vp9_ethread_test.cc
 
 LIBVPX_TEST_SRCS-yes                   += decode_test_driver.cc
@@ -91,6 +90,7 @@
 ifeq ($(findstring yes,$(CONFIG_VP9_ENCODER)$(CONFIG_VP10_ENCODER)),yes)
 LIBVPX_TEST_SRCS-yes += active_map_refresh_test.cc
 LIBVPX_TEST_SRCS-yes += active_map_test.cc
+LIBVPX_TEST_SRCS-yes += vp9_end_to_end_test.cc
 endif
 
 ##