Use LIBS not LDFROM to link against a library

There is a newish test in 02-xsdynamic.t that tries to use LDFROM
to link against another extension.  The docs for LDFROM make it
pretty clear that it is for object files, not libraries. So switch
that test to LIBS, which also greatly simplifies the test setup
because LIBS already knows about what file extensions to use for
dynamic libraries on different platforms, etc.

Author: craigberry

t/lib/MakeMaker/Test/Setup/XS.pm

@@ -203,43 +203,17 @@ $label2files{eud_consume} = +{
   %{ $label2files{basic} }, # make copy
   'Makefile.PL' => <<'EOF' .
 use File::Spec::Functions;
-my $root; BEGIN {$root = catdir(updir, qw(XS-Testeud_produce blib arch));}
+my @parts = split /::/, 'XS::Other';
+my $libdir = catdir(updir, qw(XS-Testeud_produce blib arch auto), @parts);
+my $stem = defined &DynaLoader::mod2fname ? DynaLoader::mod2fname(\@parts) : $parts[-1];
 EOF
     sprintf(
       $MAKEFILEPL, 'Test', 'Test.pm', qq{},
       q{
         DEFINE => '-DINVAR=input',
-        LDFROM => join(' ', '$(OBJECT)', map _quote_if_space($_), find_extra_libs({'XS::Other'=>undef}, [$root])),
+        LIBS   => ["-L$libdir -l$stem"],
       },
-    ) . <<'EOF',
-use Config;
-use File::Spec::Functions;
-sub _quote_if_space { $_[0] =~ / / ? qq{"$_[0]"} : $_[0] }
-my %exts; BEGIN { %exts = (
-  MSWin32 => [ ".lib", ".$Config{dlext}", $Config{_a} ],
-  cygwin => [ '.dll' ],
-  android => [ ".$Config{dlext}" ],
-); }
-sub find_extra_libs {
-  my ($deps, $search) = @_;
-  return () if !keys %$deps;
-  return () unless my $exts = $exts{$^O};
-  my @found_libs = ();
-  DEP: foreach my $name (keys %$deps) {
-    my @parts = split /::/, $name;
-    my $stem = defined &DynaLoader::mod2fname
-      ? DynaLoader::mod2fname(\@parts) : $parts[-1];
-    my @bases = map $stem.$_, @$exts;
-    for my $dir (grep -d, @$search) { # only extant dirs
-      my ($found) = grep -f, map catfile($dir, 'auto', @parts, $_), @bases;
-      next if !defined $found;
-      push @found_libs, $found;
-      next DEP;
-    }
-  }
-  @found_libs;
-}
-EOF
+    ),
   'Test.pm' => do {
     my $t = $PM_TEST; $t =~ s:is_even:is_odd:g;
     $t =~ s/bootstrap/