Suffixes which does not begin with a dot are not handled correctly

[Vladimir Panov]

automake (current CVS version) does not support languages which have an 
output extension which does not begin with a dot well. The problem is 
that $lang->output_extensions are not explicitly added to .SUFFIXES 
(instead, Automake::Rule::define adds them implicitly but separates both 
extensions of a suffix rule using a dot as a separator (e.g. 
".idlSK.cpp" is split as ".idlSK .cpp", but not as ".idl SK.cpp")).
I'd suggest that $lang->output_extensions be added explicitly to 
.SUFFIXES by adding a line in the last loop of register_language():

sub register_language (%)
{
...
 # Upate the $suffix_rule map.
 foreach my $suffix (@{$lang->extensions})
 {
   foreach my $dest (&{$lang->output_extensions} ($suffix))
   {
     register_suffix_rule (INTERNAL, $suffix, $dest);
     accept_extensions ($dest);   # the added line
   }
 }
}