Fix NMAKEHLP_NATIVE failures for Tk test-classic runs

Author: pabtor

win/rules-ext.vc

@@ -34,11 +34,6 @@ macro to the name of the project makefile.
 !if [$(CC) -nologo -DNDEBUG "nmakehlp.c" -link -subsystem:console > nul]
 !endif
 
-# First locate the Tcl directory that we are working with.
-!if "$(TCLDIR)" != ""
-
-_RULESDIR = $(TCLDIR:/=\)
-
 # We need a nmakehlp that will run on the host machine as part of the build.
 # if TCLSH_NATIVE is set for cross compilation, we'll try to find an associated 
 # nmakehlp.exe that runs on the build architecture.
@@ -56,6 +51,11 @@ _RULESDIR = $(TCLDIR:/=\)
 NMAKEHLP_NATIVE=nmakehlp
 !endif
 
+# First locate the Tcl directory that we are working with.
+!if "$(TCLDIR)" != ""
+
+_RULESDIR = $(TCLDIR:/=\)
+
 !else
 
 # If an installation path is specified, that is also the Tcl directory.