Rename 'HOST' variable for the cross compile triplet back to 'TARGET',
to avoid picking up the HOST environment variable defined on some systems.
It's the more obvious name anyway really.
Also change include directive for dependency files to just include whatever
.d files are present rather than requiring them to be generated. If a .d
file for a source file isn't there, its object file normally wouldn't be
there either, so missing dependencies aren't a concern as the object would
be treated as out-of-date anyway.


git-svn-id: http://mintty.googlecode.com/svn/trunk@1306 2782a51e-c42b-11dd-927d-974589228060