Fix C++14 compilation errors. Add casting int literals to char in config
generator to avoid narrowing conversions.
Gentoo bug: https://bugs.gentoo.org/show_bug.cgi?id=595048

--- a/src/mkdefcfg.pl
+++ b/src/mkdefcfg.pl
@@ -24,8 +24,8 @@
 
     @c = split(//, $buf);
     for ($i = 0; $i < $len; $i++) {
-        $out .= sprintf("0x%02X", ord($c[$i]));
-        if ($n++ % 10) {
+        $out .= sprintf("(char)0x%02X", ord($c[$i]));
+        if ($n++ % 5) {
             $out .= ", ";
         } else {
             $out .= ",\n";