Skip coords that is not cached when add coords into zeroing_coords list. If we don't skip normal coords, non-cached, here, cached coords that own one or more non-cached ancestors would be fail to add into redraw_man_t::zeroing_coords list.

SUBDIRS = src include tools examples inkscape
pkgconfigdir = $(libdir)/pkgconfig
pkgconfig_DATA = libmbfly.pc
EXTRA_DIST = libmbfly.pc.in Doxyfile README.h