Move build guard to the build system

Change-Id: I62f7dca3d0d5aa9648c8a444f11f0f2a8bb3845b
diff --git a/test/test.cmake b/test/test.cmake
index b73feb6..43b975c 100644
--- a/test/test.cmake
+++ b/test/test.cmake
@@ -287,6 +287,7 @@
         ${AOM_UNIT_TEST_COMMON_SOURCES}
         "${AOM_ROOT}/test/divu_small_test.cc"
         "${AOM_ROOT}/test/ethread_test.cc"
+        "${AOM_ROOT}/test/coding_path_sync.cc"
         "${AOM_ROOT}/test/idct8x8_test.cc"
         "${AOM_ROOT}/test/partial_idct_test.cc"
         "${AOM_ROOT}/test/superframe_test.cc"