libpng: removed redundant HOST_FOO_DEPENDENCIES

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libpng/libpng.mk

@@ -10,8 +10,6 @@ LIBPNG_SOURCE = libpng-$(LIBPNG_VERSION).tar.bz2
 LIBPNG_INSTALL_STAGING = YES
 LIBPNG_DEPENDENCIES = host-pkg-config zlib
 
-HOST_LIBPNG_DEPENDENCIES = host-pkg-config host-zlib
-
 define LIBPNG_STAGING_LIBPNG12_CONFIG_FIXUP
 	$(SED) "s,^prefix=.*,prefix=\'$(STAGING_DIR)/usr\',g" \
 		-e "s,^exec_prefix=.*,exec_prefix=\'$(STAGING_DIR)/usr\',g" \