kdesrc-build has long supported using a file '.refresh-me' in a build
directory as a flag to treat a module being built as if the
'--refresh-build' command line option was passed for that module.

As suggested in my last commit message, this commit will automatically
create that file if the configure/build-system-setup phase of a module
build fails. This way even if I choose wrong on which filename to look
for to determine a successful build, there will still be a way for
kdesrc-build to easily tell that it should start all over next time.