nim check allows gorgeEx but doesn't allow writeFile

[genotrance]

Nim 1.0 onwards disabled dangerous actions in nim check. However, it is unclear what should and should not work. I couldn't find an issue/PR or commit related to the topic so opening this.

This works with nim check.

static:
  echo gorgeEx("sleep 5")

This does not work with nim check.

static:
  writeFile("/tmp/abc.txt", "ABC")
  doAssert fileExists("/tmp/abc.txt")

Context for this issue is this nimterop issue.

[Araq]

This is a showstopper bug for 1.0.4, neither nimsuggest nor nim check should run staticExec nor writeFile.