Fontconfig doesn't need to be passed large file flags through CPPFLAGS because
it's configure script uses AC_SYS_LARGEFILE.

This reverts commit 5a49a24d.

(From OE-Core rev: 98f9a9fd359c356c9ce6dd0ba16a557b7a07b788)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>