versioner: replace availability attributes with annotate.

Major refactor to use __attribute__((annotate)) to be able to keep
track of the semantic differences between __INTRODUCED_IN(x) and
__INTRODUCED_IN_X86(x), for use in the upcoming preprocessor.

Bug: http://b/30170081
Change-Id: I6496a8c40ba7f4553de9a2be0bbddcf37c813937
diff --git a/tools/versioner/tests/missing_arch/headers/foo.h b/tools/versioner/tests/missing_arch/headers/foo.h
index 5d5f8f0..176e7a3 100644
--- a/tools/versioner/tests/missing_arch/headers/foo.h
+++ b/tools/versioner/tests/missing_arch/headers/foo.h
@@ -1 +1 @@
-int foo();
+int foo();
\ No newline at end of file