Remove DynaLoader

* lib/Locale/Po4a/Man.pm, lib/Locale/Po4a/Po.pm,
lib/Locale/Po4a/TransTractor.pm: Remove DynaLoader from the is-a
relationships.  DynaLoader was introduced in
0a4e526 for performance reasons.
However the XS was removed in
dbbc6d2, about 4 years ago.

lib/Locale/Po4a/Man.pm

@@ -393,15 +393,14 @@ under the terms of GPL v2.0 or later (see the COPYING file).
 =cut
 
 package Locale::Po4a::Man;
-use DynaLoader;
 
 use 5.16.0;
 use strict;
 use warnings;
 
 require Exporter;
 use vars qw(@ISA @EXPORT);
-@ISA    = qw(Locale::Po4a::TransTractor DynaLoader);
+@ISA    = qw(Locale::Po4a::TransTractor);
 @EXPORT = qw();                                        #  new initialize);
 
 # Try to use a C extension if present.

lib/Locale/Po4a/Po.pm

@@ -101,13 +101,12 @@ use IO::File;
 require Exporter;
 
 package Locale::Po4a::Po;
-use DynaLoader;
 
 use Locale::Po4a::Common qw(wrap_msg wrap_mod wrap_ref_mod dgettext);
 
 use subs qw(makespace);
 use vars qw(@ISA @EXPORT_OK);
-@ISA       = qw(Exporter DynaLoader);
+@ISA       = qw(Exporter);
 @EXPORT    = qw(%debug);
 @EXPORT_OK = qw(&move_po_if_needed);
 

lib/Locale/Po4a/TransTractor.pm

@@ -3,7 +3,6 @@
 require Exporter;
 
 package Locale::Po4a::TransTractor;
-use DynaLoader;
 
 sub import { }
 
@@ -12,9 +11,8 @@ use strict;
 use warnings;
 
 use subs qw(makespace);
-use vars qw($VERSION @ISA @EXPORT);
+use vars qw($VERSION @EXPORT);
 $VERSION = "0.74-alpha";
-@ISA     = qw(DynaLoader);
 @EXPORT  = qw(new process translate
   read write readpo writepo
   getpoout setpoout get_in_charset get_out_charset handle_yaml);