Tests/Samples fail to compile - JsDeleteProperty not marked with overload

[Darian Miller]

Adding the function overloads to the interface portion seems to correct it:

function JsDeleteProperty(Value, Prop: JsValueRef; UseStrictRules: Boolean): Boolean; overload;
function JsDeleteProperty(Value: JsValueRef; PropId: JsPropertyIdRef; UseStrictRules: Boolean): Boolean; overload;
function JsDeleteProperty(Value: JsValueRef; const PropName: UTF8String; UseStrictRules: Boolean): Boolean; overload;
function JsDeleteProperty(Value: JsValueRef; const PropName: UnicodeString; UseStrictRules: Boolean): Boolean; overload;

[Ondrej Kelle]

Thanks.