qt: fix cross build with gcc7
qt: fix cross build with gcc7

NeoChontrix/void-packages,floGik/void-packages,floGik/void-packages,floGik/void-packages,floGik/void-packages,NeoChontrix/void-packages,coredumb/void-packages,coredumb/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,floGik/void-packages,coredumb/void-packages,NeoChontrix/void-packages,floGik/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,coredumb/void-packages,NeoChontrix/void-packages,coredumb/void-packages,coredumb/void-packages