Add fopen64/freopen64/tmpfile64 aliases.

Our fopen/freopen/tmpfile are already always O_LARGEFILE, but let's add
the aliases for _LARGEFILE_SOURCE compatibility.

Bug: http://b/24807045
Change-Id: I5d99b3ef3c9f27ce70f13313f6a92e96c7f21f80
diff --git a/libc/bionic/tmpfile.cpp b/libc/bionic/tmpfile.cpp
index 602d407..dc142a9 100644
--- a/libc/bionic/tmpfile.cpp
+++ b/libc/bionic/tmpfile.cpp
@@ -112,3 +112,4 @@
   }
   return fp;
 }
+__strong_alias(tmpfile64, tmpfile);