Avoid using expat's m4 files

Upstream-Status: Inappropriate [Other]
Workaround specific to our build system.

Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Scott Garman <scott.a.garman@intel.com>

diff -bur expat-2.0.0~orig/configure.in expat-2.0.0/configure.in
--- expat-2.0.0~orig/configure.in	2006-01-10 19:10:46.000000000 -0600
+++ expat-2.0.0/configure.in	2006-02-10 19:12:24.000000000 -0600
@@ -50,9 +50,6 @@
 
 AC_CONFIG_HEADER(expat_config.h)
 
-sinclude(conftools/libtool.m4)
-sinclude(conftools/ac_c_bigendian_cross.m4)
-
 AC_LIBTOOL_WIN32_DLL
 AC_PROG_LIBTOOL