qmake: Get Qt version check in sync with its documented intention

[hartwork]

CC @tibirna @barracuda156

[barracuda156]

@hartwork That should work, I just kept a version which existed already, see: c0fb7c1

[tibirna]

To be pedantic, lessThan is not the same as !greaterThan (in this case, the latter excludes 4.8.0). Please indicate what does this intend to fix?

[hartwork]

@tibirna the messaging and in-code comment further up both indicate that >=4.8.0 is wanted but the code is actually checking for >4.8.0 without allowing for =4.8.0. The fix gets that back in sync.

[barracuda156]

@hartwork TBH, I have no idea what is the actual requirement (which is also why I didn’t bother changing that to match). But perhaps it is better to make it coherent to avoid confusion. If someone ever tries to build this with Qt 4.8.0 and that happens not to work, they could open an issue.
On the other hand, it can make sense to require 4.8.7, just to be on the safe side.

[hartwork]

@barracuda156 good to know. My mission here was just to make the code do what the comments say it's supposed to do. Maybe that's a good start?