Add supported ABIs to test description xml

Change-Id: I5c2c086164c245afd36d40216dfc8b4c23f1876a
diff --git a/CtsBuild.mk b/CtsBuild.mk
index f6d0d5c..4521b7e 100644
--- a/CtsBuild.mk
+++ b/CtsBuild.mk
@@ -30,6 +30,9 @@
 # File indicating which tests should be blacklisted due to problems.
 CTS_EXPECTATIONS := cts/tests/expectations/knownfailures.txt
 
+# File indicating which tests should be blacklisted due to unsupported abi.
+CTS_UNSUPPORTED_ABIS := cts/tests/expectations/unsupportedabis.txt
+
 # Functions to get the paths of the build outputs.
 
 define cts-get-lib-paths