.jshintrc

tests: add guard check for suid support

This adds a check for setuid and setgid support and guards a part of a test
requiring this particular filesystem feature.

Such feature is notably missing in the Nix/NixOS build sandbox and was causing
the whole test to fail for the mercurial package.

Differential Revision: https://phab.mercurial-scm.org/D11739

{
    // Enforcing
    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.
    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)

    // Environments
    "browser"       : true      // Web Browser (window, document, etc)
}