The purpose of this commit is twofold; from the user's perspective, this
provides a consistent experience whenever building a sofort-based project;
and from the developer's perspective, this provides an easy way to test
cfgdefs.mk even before the writing and/or integration of cfgdefs.sh.
- replace all echo(1) and printf(1) constructs with a single cat(1).
- do not eliminate -I${prefix}/lib and -L${exec_prefix}/lib;
- eliminate trailing spaces from the end of a line.
