Support having const encoding tables. Modify generator code to regenerate as such.

Can't simply regenerate src/common/unictabl.inc, because KOI8-U.TXT is missing, and mk_fallbacks has issues
(sort +2 isn't valid on my system)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38567 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

misc/unictabl/mk_ctable.c

@@ -44,7 +44,7 @@ int main(int argc, char *argv[])
            " * %s to Unicode recoding table\n"
            " * based on file %s by Unicode Consortium\n"
            " */\n\n"
-           "static wxUint16 encoding_table__%s[128] = {",
+           "static const wxUint16 encoding_table__%s[128] = {",
            argv[2], argv[1], argv[2]);
            
     for (i = 128; i < 256; i++)