Always use `__foo__` for attribute names.

To avoid collisions with other macros.

Change-Id: I015639043deaceccaf5f11365f8bdc45ca703da5
diff --git a/libc/include/bits/struct_file.h b/libc/include/bits/struct_file.h
index abbd320..8cb8d28 100644
--- a/libc/include/bits/struct_file.h
+++ b/libc/include/bits/struct_file.h
@@ -39,6 +39,6 @@
 #else
   char __private[84];
 #endif
-} __attribute__((aligned(sizeof(void*))));
+} __attribute__((__aligned__(sizeof(void*))));
 
 __END_DECLS