fix punk::mix / make.tcl so it doesn't attempt to navigate . and .. folders on unix-like platforms when copying files

src/modules/punk/mix-0.2.tm

@@ -596,6 +596,9 @@ namespace eval punk::mix::cli {
             set subdirs [glob -nocomplain -dir $srcdir -type d -tail *]
             set hiddensubdirs [glob -nocomplain -dir $srcdir -type {hidden d} -tail *]
             foreach h $hiddensubdirs {
+                if {$h in [list "." ".."]} {
+                    continue
+                }
                 if {$h ni $subdirs} {
                     lappend subdirs $h
                 }