* stepmake/stepmake/python-module-rules.make:

* stepmake/stepmake/python-module-rules.make:
* stepmake/stepmake/python-module-vars.make:
* stepmake/stepmake/shared-library-vars.make: Add Cygwin support.

* stepmake/stepmake/generic-vars.make:
* cygwin/GNUmakefile: Fix Cygwin build detection.

* stepmake/stepmake/shared-library-rules.make: Remove version juggling.

* stepmake/stepmake/shared-library-targets.make: Default target
includes version, add target libFOO.

* lily/main.cc: Temporary fix for access to scm_read_opts array
from shared Cygwin library.