rust-cpython: build via HGWITHRUSTEXT=cpython
The existing behaviour, building the direct ffi bindings if
HGIWTHRUSTEXT is just set is unchanged, but if HGWITHRUSTEXT is
cpython, then the cpython bindings (aka mercurial/rustext.so) are
built.
Differential Revision: https://phab.mercurial-scm.org/D5436
{
// 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)
}