[gimp-perl] add missing CONFIGURE_REQUIRES

[Ed J <edj src gnome org>]

commit 37f811e7fd38b9578572e15e2f1a9d5472ab32e9
Author: Ed J <edj src gnome org>
Date:   Sat May 7 16:57:47 2016 +0100

    add missing CONFIGURE_REQUIRES

 Makefile.PL |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.PL b/Makefile.PL
index 23ff35b..4301e72 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -54,6 +54,8 @@ WriteMakefile(
     ExtUtils::Depends  => '0.402',
     'Alien::Gimp'      => '0.01',
     IO::All            => 0,
+    Gtk2               => 1.0,
+    'PDL'              => '2.007_04',
   },
   TEST_REQUIRES        => {
     'Test::More'       => '0.88',