remove the dependency on the Carp::Assert perl module

src/gen_enum_parse.pl

@@ -2,7 +2,14 @@
 
 use strict;
 use warnings;
-use Carp::Assert;
+
+sub assert {
+  unless($_[0]) {
+    require Carp;
+    Carp::confess();
+  }
+  return undef;
+}
 
 sub _OUT {
     my $fd = shift;