- Add line continuation support so empty macros can be used at
the end of configure command lines, ie RTEMS kernel. The
config parser removes empty lines and wihout this support a
trailing line continuation character joins a configure command
line to next command.
- Fix freetype's gmake support for non-GNU operating systems.
The support is added at the top level and so not lost when we
move to a new version of RTEMS.
The change also moves all 3rd party packages to use a common
rtems-package.bset build set file.
All packages except Microwindows itself build cleanly.
