add dummy test_dynamic rule for newer EUMM (RT #124910)

Author: eserte

JPEG/Makefile.jpeg.maybe

@@ -36,4 +36,29 @@ else
   local $ENV{LDFLAGS} = "$Config{ccflags} $Config{ldflags}";
   system(sh => "./configure");
  }
+
+my $seen_empty_rule;
+open my $fh, '<', 'Makefile' or die "Error opening Makefile: $!";
+while(<$fh>)
+ {
+  if (/# Empty rule needed/)
+   {
+    $seen_empty_rule = 1;
+    last;
+   }
+ }
+if (!$seen_empty_rule)
+ {
+  open my $ofh, '>>', 'Makefile' or die "Error appending to Makefile: $!";
+  print $ofh <<'EOF';
+
+# Empty rules needed since ExtUtils::MakeMaker 7.18 (see https://rt.cpan.org/Ticket/Display.html?id=117800)
+test_dynamic:
+
+subdirs-test_dynamic:
+
+EOF
+  close $ofh or die "Error closing Makefile: $!";
+}
+
 1;

PNG/Makefile.libpng.maybe

@@ -101,6 +101,9 @@ clean:
 # Empty rule needed since ExtUtils::MakeMaker 6.36 (ca.)
 test:
 
+# Empty rule needed since ExtUtils::MakeMaker 7.18 (see https://rt.cpan.org/Ticket/Display.html?id=117800)
+test_dynamic:
+
 EOF
      return 1;
     }

PNG/Makefile.zlib.maybe

@@ -29,4 +29,27 @@ else
   local $ENV{CFLAGS} = "$Config{ccflags} $Config{cccdlflags}";
   system(sh => "./configure");
  }
+
+my $seen_empty_rule;
+open my $fh, '<', 'Makefile' or die "Error opening Makefile: $!";
+while(<$fh>)
+ {
+  if (/# Empty rule needed/)
+   {
+    $seen_empty_rule = 1;
+    last;
+   }
+ }
+if (!$seen_empty_rule)
+ {
+  open my $ofh, '>>', 'Makefile' or die "Error appending to Makefile: $!";
+  print $ofh <<'EOF';
+
+# Empty rule needed since ExtUtils::MakeMaker 7.18 (see https://rt.cpan.org/Ticket/Display.html?id=117800)
+test_dynamic:
+
+EOF
+  close $ofh or die "Error closing Makefile: $!";
+}
+
 1;