Follow symlinks when using find for assets

define find-subdir-assets

$(sort $(if $(1),$(patsubst ./%,%, \

	$(shell if [ -d $(1) ] ; then cd $(1) ; find ./ -not -name '.*' -and -type f -and -not -type l ; fi)), \

	$(shell if [ -d $(1) ] ; then cd $(1) ; find -L ./ -not -name '.*' -and -type f ; fi)), \

	$(warning Empty argument supplied to find-subdir-assets) \

))

endef