Simplify, and replace use of QRegExp with QRegularExpression for Qt6
compatibility.
Also fix the test running on Windows. RockboxInfo constructs the
filename from path and filename, so we cannot pass an empty path, since
that results in an invalid path. On Linux / MacOS this works only
because we use an absolute path.
Change-Id: Ieaf30a2df005291d3e997aabf42d64ee832381c2
The former is not part of Qt6 anymore, while the latter has been
introduced with Qt5. We don't support Qt4 anymore, so move to
QRegularExpression.
Change-Id: Icc15ef422790f3740660c5581294aa0536f46b1f
rbutil uses several components from the utils folder, and can be
considered part of utils too. Having it in a separate folder is an
arbitrary split that doesn't help anymore these days, so merge them.
This also allows other utils to easily use libtools.make without the
need to navigate to a different folder.
Change-Id: I3fc2f4de19e3e776553efb5dea5f779dfec0dc21
