xplat: fix ch crash with -args ... -endargs
xplat: fix ch crash with -args ... -endargs

On Linux we have a narrow-to-wide argv conversion, and `free argv[i]`
afterwards. However, when ch command line has `-args ... -endargs`,
`HostConfigFlags` will change `argv[]`, thus when back to `main` the
`free argv[i]` will crash.

Fix by calling with a copy of args.

mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore