Fix building with Qt 4.7.

QUrl::isLocalFile() is available starting with Qt 4.8. We can safely check for
a file:// url instead.

Qt 4.8 dropped support for OS X 10.4 / 10.5. Since we're still supporting those
we need to keep using Qt 4.7 on OS X. We might want to consider requiring at
least 10.6 on OS X with the next major release of Rockbox Utility.

Change-Id: I18998fe3c7a38773479bc7a1c32ca6e4966359e9
1 file changed