package/imagemagick: security bump to version 7.0.7-1

Quoting CVE-related issues from
https://github.com/ImageMagick/ImageMagick/blob/master/ChangeLog

2017-07-29 7.0.6-5 Glenn Randers-Pehrson <glennrp@image...>
  * Fix improper use of NULL in the JNG decoder (CVE-2017-11750, Reference
    ImageMagick/ImageMagick#632).

2017-07-24 7.0.6-4 Cristy <quetzlzacatenango@image...>
  * Fixed numerous memory leaks (reference
    https://github.com/ImageMagick/ImageMagick/issues) including
    ImageMagick/ImageMagick#618 (CVE-2017-12676).

2017-07-23  7.0.6-3 Glenn Randers-Pehrson <glennrp@image...>
  * Fix memory leaks when reading a malformed JNG image:
    ImageMagick/ImageMagick#600 (CVE-2017-13141),
    ImageMagick/ImageMagick#602 (CVE-2017-12565).

2017-07-19 7.0.6-2 Cristy <quetzlzacatenango@image...>
  * coders/png.c: fixed memory leak of quantum_info (CVE-2017-11539, reference
    ImageMagick/ImageMagick#582
  * coders/png.c: fixed NULL dereference when trying to write an empty MNG
    (CVE-2017-11522, reference
    ImageMagick/ImageMagick#586).

2017-06-22  7.0.6-1 Glenn Randers-Pehrson <glennrp@image...>
  * Stop a memory leak in read_user_chunk_callback() (reference
    ImageMagick/ImageMagick#517,
    CVE 2017-11310).

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit 1cf1b98)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/imagemagick/imagemagick.hash

@@ -1,2 +1,2 @@
 # Locally computed
-sha256 3a6b21352ed0eb984bdbd0943471df8605b978b527125921e97e5b404f2bee3a  7.0.6-0.tar.gz
+sha256 5a45e29509dbb23793a9c8db5c47ef1114c1ee82c9ca60053eaf06b3fc243e2c  7.0.7-1.tar.gz

package/imagemagick/imagemagick.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-IMAGEMAGICK_VERSION = 7.0.6-0
+IMAGEMAGICK_VERSION = 7.0.7-1
 IMAGEMAGICK_SOURCE = $(IMAGEMAGICK_VERSION).tar.gz
 IMAGEMAGICK_SITE = https://github.com/ImageMagick/ImageMagick/archive
 IMAGEMAGICK_LICENSE = Apache-2.0