Fix issue of fault to build for ubunutu. - make build shape_path.c before generate precomputed.h while shape_path.c need it. - It is fixed by moving both precomputed.c & precomputed.h to BUILT_SROUCES. - see http://www.gnu.org/software/automake/manual/\ automake.html#Built-Sources-Example

# -*- 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