versioner: add extern "C" to tests.

Bug: https://github.com/android-ndk/ndk/issues/440
Test: python run_tests.py
Change-Id: Id893979146bc609a17bd1fa2a6bec6f10dfe4804
diff --git a/tools/versioner/tests/version_mismatch/expected_fail b/tools/versioner/tests/version_mismatch/expected_fail
index f83f71c..f2143a3 100644
--- a/tools/versioner/tests/version_mismatch/expected_fail
+++ b/tools/versioner/tests/version_mismatch/expected_fail
@@ -1,8 +1,8 @@
 versioner: inconsistent availability for symbol 'foo'
 versioner: failed to calculate symbol availability
   foo: invalid
-    extern declaration @ headers/foo.h:2:1
+    extern declaration @ headers/foo.h:6:1
       introduced = 9
-    extern declaration @ headers/foo.h:4:1
+    extern declaration @ headers/foo.h:8:1
       introduced = 10
 versioner: sanity check failed