marks flick() as unimplemented in dmstandard (#2092)

Author: hry-gh

DMCompiler/DMStandard/_Standard.dm

@@ -23,6 +23,7 @@ proc/findtextEx(Haystack, Needle, Start = 1, End = 0) as num
 proc/findlasttext(Haystack, Needle, Start = 0, End = 1) as num
 proc/findlasttextEx(Haystack, Needle, Start = 0, End = 1) as num
 proc/flick(Icon, Object)
+	set opendream_unimplemented = 1
 proc/flist(Path) as /list
 proc/floor(A) as num
 proc/fract(n) as num