Stringify api_level in <android/versioning.h>.

Make it so that we can use __ANDROID_API_<letter>__ constants in
__INTRODUCED_IN macros.

Test: treehugger
Change-Id: I0929c01e23e58f51d12f73200e1daf5ef484ea5d
diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index 33daa7c..26a05c8 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -38,7 +38,6 @@
 #define	_SYS_CDEFS_H_
 
 #include <android/api-level.h>
-#include <android/versioning.h>
 
 #define __BIONIC__ 1
 
@@ -103,6 +102,8 @@
 
 #include <android/versioning.h>
 
+#include <android/versioning.h>
+
 #define __always_inline __attribute__((__always_inline__))
 #define __attribute_const__ __attribute__((__const__))
 #define __attribute_pure__ __attribute__((__pure__))