libGL: depend on llvm3.9; fix depends
libGL: depend on llvm3.9; fix depends

Since llvm-5.0.1 can't be built for arm* and mips* use llvm3.9 for now.
Fix depends listed in #10197

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