Upgrade to ImageMagick6 version 6.9.8-10.

Upstream changes:

2017-06-10  6.9.8-10 Cristy  <quetzlzacatenango@image...>
  * Release ImageMagick version 6.9.8-10, GIT revision 11637:eb6f363:20170610.

2017-06-10  6.9.8-10 Cristy  <quetzlzacatenango@image...>
  * Introduce SetMagickSecurityPolicy() (MagickCore) and
    MagickSetSecurityPolicy() (MagickWand) to set the ImageMagick security
    policy (reference ImageMagick/ImageMagick#407).

2017-06-02  6.9.8-9 Cristy  <quetzlzacatenango@image...>
  * Release ImageMagick version 6.9.8-9, GIT revision 11625:91bb35e:20170602.

2017-06-02  6.9.8-9 Cristy  <quetzlzacatenango@image...>
  * Fix choppy bitmap font rendering (reference
    https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=32071).
  * Add support for 'hex:' property.

2017-05-28  6.9.8-8 Cristy  <quetzlzacatenango@image...>
  * Release ImageMagick version 6.9.8-8, GIT revision 11606:8b67333:20170528.

2017-05-28  6.9.8-8 Cristy  <quetzlzacatenango@image...>
  * Transient error validating the JPEG-2000 image format (reference
    ImageMagick/ImageMagick#501).
  * Properly allocate DCM image colormap (reference
    https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=32063).

2017-05-26  6.9.8-7 Cristy  <quetzlzacatenango@image...>
  * Release ImageMagick version 6.9.8-7, GIT revision 11598:07d1dee:20170526.

2017-05-23  6.9.8-7 Cristy  <quetzlzacatenango@image...>
  * Improper allocation of memory for IM instances without threads (reference
          ImageMagick/ImageMagick#497).
  * Delete corrupt image from list (reference
    ImageMagick/ImageMagick#500).

2017-05-19  6.9.8-6 Cristy  <quetzlzacatenango@image...>
  * Release ImageMagick version 6.9.8-6, GIT revision 11590:7ce2d38:20170519.

2017-05-15  6.9.8-6 Cristy  <quetzlzacatenango@image...>
  * Support various image operators for the compare utility (reference
    https://www.imagemagick.org/discourse-server/viewtopic.php?f=2&t=31938).

graphics/ImageMagick6/Makefile.common

@@ -1,10 +1,10 @@
-# $NetBSD: Makefile.common,v 1.7 2017/05/17 13:21:36 he Exp $
+# $NetBSD: Makefile.common,v 1.8 2017/06/14 09:56:20 he Exp $
 #
 # When updating this package, please upload the distfile
 # since they disappear immediately when new releases happen.
 
 IM_MAJOR_VER=		6.9.8
-IM_MINOR_VER=		5
+IM_MINOR_VER=		10
 IM_MAJOR_LIB_VER=	6
 
 .if (${IM_MINOR_VER} != NONE)

graphics/ImageMagick6/distinfo

@@ -1,7 +1,7 @@
-$NetBSD: distinfo,v 1.4 2017/05/17 13:21:36 he Exp $
+$NetBSD: distinfo,v 1.5 2017/06/14 09:56:20 he Exp $
 
-SHA1 (ImageMagick-6.9.8-5.tar.xz) = 887e32a70b1334a3c37a8895662d9a648375896b
-RMD160 (ImageMagick-6.9.8-5.tar.xz) = b7216f2850c2a2257d9421bec51aa04c40c0aae1
-SHA512 (ImageMagick-6.9.8-5.tar.xz) = af1838664a6e5501726da04b437bc870271d5d79cabf697cf52fea5447ccf8df508787c6c72310f46c400afe16541aa2bc4e14c3057dc0900c921607483406a8
-Size (ImageMagick-6.9.8-5.tar.xz) = 8781672 bytes
+SHA1 (ImageMagick-6.9.8-10.tar.xz) = cf2411cdf8e53b2ff7745497d0b56d7d159c45ce
+RMD160 (ImageMagick-6.9.8-10.tar.xz) = 2c1e238b34f8c6365173c7cb6d812fab9d365b81
+SHA512 (ImageMagick-6.9.8-10.tar.xz) = 384da7332ab65a07be77c48d183207f9c378ace43eff0f19633dd704a92c0801314313b9c1164c462f9db163dc860dcebbf174df399977dc9e37568d8c172fe5
+Size (ImageMagick-6.9.8-10.tar.xz) = 8776728 bytes
 SHA1 (patch-Makefile.in) = bb747b5e062f2a59e307289b5b33861dd5f96ab0