backintime: update to 1.1.20
backintime: update to 1.1.20

This commit also changes the distfiles URL and the homepage to URLs
that resolve as the upstream project has moved its hosting completely
to GitHub.  This commit resolves #6747.

gangsterakato/void-packages,juliendehos/void-packages,coredumb/void-packages,coredumb/void-packages,floGik/void-packages,opsaaspo/void-packages,opsaaspo/void-packages,opsaaspo/void-packages,gangsterakato/void-packages,floGik/void-packages,ayghor/void-packages,necrophcodr/void-packages,floGik/void-packages,coredumb/void-packages,kulinacs/void-packages,kulinacs/void-packages,liwakura/void-packages,liwakura/void-packages,juliendehos/void-packages,EaterOfCode/void-packages,necrophcodr/void-packages,gangsterakato/void-packages,floGik/void-packages,juliendehos/void-packages,Bubble-be/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,Bubble-be/void-packages,Bubble-be/void-packages,WKuipers/void-packages,floGik/void-packages,opsaaspo/void-packages,WKuipers/void-packages,NeoChontrix/void-packages,WKuipers/void-packages,floGik/void-packages,EaterOfCode/void-packages,kulinacs/void-packages,necrophcodr/void-packages,liwakura/void-packages,ayghor/void-packages,juliendehos/void-packages,ayghor/void-packages,ayghor/void-packages,gangsterakato/void-packages,juliendehos/void-packages,EaterOfCode/void-packages,EaterOfCode/void-packages,Bubble-be/void-packages,NeoChontrix/void-packages,kulinacs/void-packages,Bubble-be/void-packages,opsaaspo/void-packages,ayghor/void-packages,liwakura/void-packages,coredumb/void-packages,Bubble-be/void-packages,kulinacs/void-packages,gangsterakato/void-packages,WKuipers/void-packages,NeoChontrix/void-packages,juliendehos/void-packages,WKuipers/void-packages,gangsterakato/void-packages,kulinacs/void-packages,EaterOfCode/void-packages,coredumb/void-packages,liwakura/void-packages,coredumb/void-packages,WKuipers/void-packages,opsaaspo/void-packages,necrophcodr/void-packages,ayghor/void-packages,liwakura/void-packages,NeoChontrix/void-packages