Migrate libandroid headers to ndk_headers.

Test: make native
Bug: http://b/30465923
Change-Id: I0ef0b3630670241c4efd22515b6ab13eb41a81b3
diff --git a/include/android/asset_manager.h b/include/android/asset_manager.h
index d654839..beb6549 100644
--- a/include/android/asset_manager.h
+++ b/include/android/asset_manager.h
@@ -26,6 +26,8 @@
 #ifndef ANDROID_ASSET_MANAGER_H
 #define ANDROID_ASSET_MANAGER_H
 
+#include <sys/cdefs.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -131,6 +133,7 @@
  */
 off_t AAsset_seek(AAsset* asset, off_t offset, int whence);
 
+#if __ANDROID_API__ >= 13
 /**
  * Seek to the specified offset within the asset data.  'whence' uses the
  * same constants as lseek()/fseek().
@@ -141,6 +144,7 @@
  * Returns the new position on success, or (off64_t) -1 on error.
  */
 off64_t AAsset_seek64(AAsset* asset, off64_t offset, int whence);
+#endif
 
 /**
  * Close the asset, freeing all associated resources.
@@ -159,23 +163,27 @@
  */
 off_t AAsset_getLength(AAsset* asset);
 
+#if __ANDROID_API__ >= 13
 /**
  * Report the total size of the asset data. Reports the size using a 64-bit
  * number insted of 32-bit as AAsset_getLength.
  */
 off64_t AAsset_getLength64(AAsset* asset);
+#endif
 
 /**
  * Report the total amount of asset data that can be read from the current position.
  */
 off_t AAsset_getRemainingLength(AAsset* asset);
 
+#if __ANDROID_API__ >= 13
 /**
  * Report the total amount of asset data that can be read from the current position.
  *
  * Uses a 64-bit number instead of a 32-bit number as AAsset_getRemainingLength does.
  */
 off64_t AAsset_getRemainingLength64(AAsset* asset);
+#endif
 
 /**
  * Open a new file descriptor that can be used to read the asset data. If the
@@ -187,6 +195,7 @@
  */
 int AAsset_openFileDescriptor(AAsset* asset, off_t* outStart, off_t* outLength);
 
+#if __ANDROID_API__ >= 13
 /**
  * Open a new file descriptor that can be used to read the asset data.
  *
@@ -197,6 +206,7 @@
  * compressed).
  */
 int AAsset_openFileDescriptor64(AAsset* asset, off64_t* outStart, off64_t* outLength);
+#endif
 
 /**
  * Returns whether this asset's internal buffer is allocated in ordinary RAM (i.e. not