The Xcode generator seems to have been written with the assumption that
writeMakeParts() would be called with the output directory as the current
directory, but that's not the case when shadow-building. Perhaps this
was changed in qmake at some point, and the Xcode generator was not
updated to reflect that.
Instead of replacing every occurance of fileFixify and other logic to
deal with paths, we just chdir into the output_dir for the duration
of the function (except when writing the 'make qmake' makefile, as
the regular makefile generator works as expected with the current
directory set to the input directory).
Change-Id: I6ba492036d73f29f4adbd7cd554db9504050629e
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>
dd5b437d6a