Expose __srefill for LP64 until we can fix the NDK.

The LP64 has a duplicate copy of part of stdio, and relies
on bionic supplying this part. We should remove the hack from
the NDK, at least for LP64, and then revert this.

Bug: 15291317
Change-Id: I75e06e130188ca0aeb9d50dfe3a3e48a1d3968b7
diff --git a/libc/stdio/local.h b/libc/stdio/local.h
index 3c5388c..151e009 100644
--- a/libc/stdio/local.h
+++ b/libc/stdio/local.h
@@ -54,7 +54,9 @@
  * The NDK apparently includes an android_support.a library that
  * refers to __srefill in its copy of the vsnprintf implementation.
  */
-__LIBC_HIDDEN__ int __srefill(FILE*);
+/* TODO(LP64): __LIBC_HIDDEN__ int __srefill(FILE*);*/
+/* http://b/15291317: the LP64 NDK needs to be fixed to remove that cruft. */
+__LIBC_ABI_PUBLIC__ int __srefill(FILE*);
 #else
 __LIBC_ABI_PUBLIC__ int __srget(FILE*);
 __LIBC_ABI_PUBLIC__ int __swbuf(int, FILE*);