Add support out-of-tree builds.
This commit adds a support for out-of-tree builds, i.e, object files,
executables and so on are writen to `$(OUTDIR)` (which defaults to
`build/<BUILD_TARGET>` directory.
This allows building Smalltalk/X from single source tree for multiple
targets.
Warning:
All link files must be created with absolute path to the executable & the working path (no variables permitted!)
This is probably the best way:
mklink /H C:\users\<user_id>\desktop\smalltalk.lnk C:\prg_sdk\Stx_stable\stx-jv\build\stx\projects\smalltalk\smalltalk_close_shell.lnk