mozjs24: add C{,XX]FLAGS taken from mozjs52
mozjs24: add C{,XX]FLAGS taken from mozjs52

Try to solve #9303

coredumb/void-packages,EaterOfCode/void-packages,necrophcodr/void-packages,EaterOfCode/void-packages,NeoChontrix/void-packages,kulinacs/void-packages,kulinacs/void-packages,floGik/void-packages,juliendehos/void-packages,floGik/void-packages,kulinacs/void-packages,kulinacs/void-packages,floGik/void-packages,floGik/void-packages,NeoChontrix/void-packages,coredumb/void-packages,floGik/void-packages,kulinacs/void-packages,coredumb/void-packages,coredumb/void-packages,EaterOfCode/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,coredumb/void-packages,juliendehos/void-packages,juliendehos/void-packages,EaterOfCode/void-packages,juliendehos/void-packages,NeoChontrix/void-packages,juliendehos/void-packages,EaterOfCode/void-packages,coredumb/void-packages,NeoChontrix/void-packages,kulinacs/void-packages,floGik/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,juliendehos/void-packages,NeoChontrix/void-packages