Change android_dlextinfo flags to uint64_t

Change-Id: Id27e8f8e58dbcf6ae79644f2ad3af3dd0aef9ae7
diff --git a/libc/include/android/dlext.h b/libc/include/android/dlext.h
index 616e08e..5c3a206 100644
--- a/libc/include/android/dlext.h
+++ b/libc/include/android/dlext.h
@@ -63,7 +63,7 @@
 };
 
 typedef struct {
-  int     flags;
+  uint64_t flags;
   void*   reserved_addr;
   size_t  reserved_size;
   int     relro_fd;