libpng: bump to version 1.6.6

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libpng/libpng.mk

@@ -4,15 +4,16 @@
 #
 ################################################################################
 
-LIBPNG_VERSION = 1.4.12
-LIBPNG_SERIES = 14
-LIBPNG_SOURCE = libpng-$(LIBPNG_VERSION).tar.bz2
+LIBPNG_VERSION = 1.6.6
+LIBPNG_SERIES = 16
+LIBPNG_SOURCE = libpng-$(LIBPNG_VERSION).tar.xz
 LIBPNG_SITE = http://downloads.sourceforge.net/project/libpng/libpng${LIBPNG_SERIES}/$(LIBPNG_VERSION)
 LIBPNG_LICENSE = libpng license
 LIBPNG_LICENSE_FILES = LICENSE
 LIBPNG_INSTALL_STAGING = YES
 LIBPNG_DEPENDENCIES = host-pkgconf zlib
 LIBPNG_CONFIG_SCRIPTS = libpng$(LIBPNG_SERIES)-config libpng-config
+LIBPNG_CONF_OPT = $(if $(BR2_ARM_CPU_HAS_NEON),--enable-arm-neon=yes,--enable-arm-neon=no)
 
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))