imagemagick: add license info

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/imagemagick/imagemagick.mk

@@ -11,6 +11,9 @@ IMAGEMAGICK_SOURCE = ImageMagick-$(IMAGEMAGICK_VERSION).tar.bz2
 # available, which is annoying. Use an alternate site that keeps all
 # older versions.
 IMAGEMAGICK_SITE = ftp://ftp.nluug.nl/pub/ImageMagick/
+IMAGEMAGICK_LICENSE = Apache-v2
+IMAGEMAGICK_LICENSE_FILES = LICENSE
+
 IMAGEMAGICK_INSTALL_STAGING = YES
 IMAGEMAGICK_AUTORECONF = YES