Fix bug of clearing COF_TEMP_MARK. draw_shapes_in_dirty_areas() mark COF_TEMP_MARK on coords and clear them before leaving. But, it always clear the same one coord for several times and keep others untouched. It is a logical error. It can be avoided by avoiding to use the variable at mutliple place for different purpose in a function, and compiler will check it out by yelling that the variable is used before assigning a value.

# -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
# vim: sw=4:ts=8:sts=4
m4datadir = $(datadir)/mb
dist_m4data_DATA = foreach.m4 mb_c_header.m4 mb_c_source.m4
dist_bin_SCRIPTS = svg2code.py