Restore the libsync __ANDROID_API__ guard

Partially reverts 2a358106b7e554396088506e8e817520e2882aee

Bug: http://b/111668906
Test: m
Change-Id: Ic35091e10edda12a97992fbeffefda7ddf1305a1

1 files changed, 5 insertions, 0 deletions

diff --git a/libsync/include/ndk/sync.h b/libsync/include/ndk/sync.h
index 49f01e142..ba7d8c4db 100644
--- a/libsync/include/ndk/sync.h
+++ b/libsync/include/ndk/sync.h
@@ -27,11 +27,14 @@
 #define ANDROID_SYNC_H
 
 #include <stdint.h>
+#include <sys/cdefs.h>
 
 #include <linux/sync_file.h>
 
 __BEGIN_DECLS
 
+#if __ANDROID_API__ >= 26
+
 /* Fences indicate the status of an asynchronous task. They are initially
  * in unsignaled state (0), and make a one-time transition to either signaled
  * (1) or error (< 0) state. A sync file is a collection of one or more fences;
@@ -88,6 +91,8 @@ static inline struct sync_fence_info* sync_get_fence_info(const struct sync_file
 /** Free a struct sync_file_info structure */
 void sync_file_info_free(struct sync_file_info* info) __INTRODUCED_IN(26);
 
+#endif /* __ANDROID_API__ >= 26 */
+
 __END_DECLS
 
 #endif /* ANDROID_SYNC_H */