[Development] make qt4 work with long building path

[ChenQi]

Hi all,

Attached is a patch that makes qt4 work with long building path.

If qt4 is integrated into other projects, in my case, Yocto, it's likely 
that the 256 length limit of its building path is not enough. See more 
details in attachment.

Sorry if I'm sending this to the wrong ML. (If so, could someone tell me 
which mailing list I should go to?)

Best Regards,
Chen Qi
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