Add boot -c flag to nekotools help

[tobil4sk]

Closes #226.

nekotools boot -c should be preferred over nekotools boot since it avoids all the problems mentioned in #130. Also, a properly compiled executable allows setting custom rpath values, which fixes the library loading issues mentioned in #226. Perhaps the raw boot command should be deprecated and removed from the help menu?

It now looks like this:

Neko Tools v1.0 - (c)2005-2022 Haxe Foundation
Usage : nekotools [options]
 Options :
  server  : start a neko web server
  boot <file.n> : build a standalone executable
  boot -c <file.n> : build a standalone c program

[Simn]

I don't understand what happens here, doesn't that first thing shadow the second thing?

[tobil4sk]

The second entry overrides the first one. I've tested and both boot and boot -c still work properly. They are the same command, just needed a way to document the -c flag, and I didn't want to redo the argument parsing module for this so I just went with this hack. :P

[Simn]

Ah, well, if you say so!