imagemagick: security bump to version 6.9.0-3

Fixes many of the reported security audit vulnerabilities:
http://www.openwall.com/lists/oss-security/2014/12/24/1

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/imagemagick/imagemagick.hash

@@ -1,2 +1,2 @@
 # From ftp://ftp.nluug.nl/pub/ImageMagick/digest.rdf
-sha256	ce7ced11cc1019cd37518ebc4ea03ffaff8e6891aaf41a05615689dafe854ff6  ImageMagick-6.9.0-2.tar.xz
+sha256	f00452ba2c05c2df9624c62d7adb49ecf17140edd6e5f355cceca051dab1fb38  ImageMagick-6.9.0-3.tar.xz

package/imagemagick/imagemagick.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-IMAGEMAGICK_VERSION = 6.9.0-2
+IMAGEMAGICK_VERSION = 6.9.0-3
 IMAGEMAGICK_SOURCE = ImageMagick-$(IMAGEMAGICK_VERSION).tar.xz
 # The official ImageMagick site only keeps the latest versions
 # available, which is annoying. Use an alternate site that keeps all