configure: Use AC_SYS_LARGEFILE to enable large file support

Signed-off-by: Matt Turner <mattst88@gmail.com>

configure.ac

@@ -50,6 +50,9 @@ AC_CHECK_FUNCS([strdup strcasecmp])
 # Checks for pkg-config packages
 PKG_CHECK_MODULES(XKBCOMP, [x11 xkbfile xproto >= 7.0.17])
 
+# Checks for typedefs, structures, and compiler characteristics.
+AC_SYS_LARGEFILE
+
 AC_ARG_WITH([xkb_config_root],
     [AS_HELP_STRING([--with-xkb-config-root=<paths>],
         [Set default XKB config root (default: ${datadir}/X11/xkb)])],