Upgrade bison from 2.3 to 2.7

See README.android for how the upgrade was done.

Bug: 8517572
Change-Id: I1e42ab59ff385130a7e488371c6058a13add244d
diff --git a/m4/printf-posix-rpl.m4 b/m4/printf-posix-rpl.m4
new file mode 100644
index 0000000..5bac077
--- /dev/null
+++ b/m4/printf-posix-rpl.m4
@@ -0,0 +1,26 @@
+# printf-posix-rpl.m4 serial 4
+dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_PRINTF_POSIX],
+[
+  AC_REQUIRE([gl_FUNC_VFPRINTF_POSIX])
+  if test $gl_cv_func_vfprintf_posix = no; then
+    gl_REPLACE_PRINTF
+  fi
+])
+
+AC_DEFUN([gl_REPLACE_PRINTF],
+[
+  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
+  AC_REQUIRE([gl_ASM_SYMBOL_PREFIX])
+  AC_LIBOBJ([printf])
+  REPLACE_PRINTF=1
+  AC_DEFINE([REPLACE_PRINTF_POSIX], [1],
+    [Define if printf is overridden by a POSIX compliant gnulib implementation.])
+  gl_PREREQ_PRINTF
+])
+
+AC_DEFUN([gl_PREREQ_PRINTF], [:])