Fix pragmas

[AmjadHD]

• Sublime Text and Github's grammar parsers are different. It works fine in ST, but it breaks github's.

  
  when defined(gcc) and defined(windows):
  when defined(x86):
  {.link: "icons/koch.res".}
  else:
  {.link: "icons/koch_icon.o".}

when defined(amd64) and defined(windows) and defined(vcc): {.link: "icons/koch-amd64-windows-vcc.res".} when defined(i386) and defined(windows) and defined(vcc): {.link: "icons/koch-i386-windows-vcc.res".}

import std/[os, strutils, parseopt, osproc]

Using std/os instead of os to fail early if config isn't set up properly.

If this fails with: Error: cannot open file: std/os, see

https://github.com/nim-lang/Nim/pull/14291 for explanation + how to fix.

when defined(nimPreviewSlimSystem): import std/[assertions, syncio]

@Varriount. Please merge asap !

[ghost]

@Varriount sorry to ping, but any news? Currently GitHub syntax highlighting for Nim is broken for pragmas and all code after them.