fix runtime-fallback sdxpath commandline

src/make.tcl

@@ -2765,11 +2765,12 @@ if {$sdxpath eq ""} {
                         set testpath $rtfolder/$rtname
                         if {[file exists $testpath]} {
                             if {[file type $testpath] eq "directory"} {
-                                set tclkitpath $rtfolder/[punkboot::lib::runtime_buildcopyname $testpath]
+                                set alt_tclkitpath $rtfolder/[punkboot::lib::runtime_buildcopyname $testpath]
                             } else {
-                                set tclkitpath $testpath
+                                set alt_tclkitpath $testpath
                             }
-                            if {$tclkitpath ne "" && [file exists $tclkitpath]} {
+                            if {[file exists $alt_tclkitpath]} {
+                                set sdxpath [list {*}$alt_tclkitpath $binfolder/sdx.kit]
                                 break
                             }
                         }