plug-ins: latest perl or whatever seems to need "require './plugin-defs.pl';"

instead of just "require 'plugin-defs.pl';".

plug-ins/common/mkgen.pl

@@ -21,7 +21,7 @@ open MK, "> $outmk";
 open IGNORE, "> $outignore";
 open RC, "> $outrc";
 
-require 'plugin-defs.pl';
+require './plugin-defs.pl';
 
 $bins = ""; $opts = "";