regrtest.py now runs python in build/test_python_xxx. (deeper than here)
So failed to load tcl/tk dll because $(dist)/tcltk/bin was set to PATH as
relative path. (Windows)
diff --git a/PCbuild/rt.bat b/PCbuild/rt.bat
index f3c4829..7129e20 100644
--- a/PCbuild/rt.bat
+++ b/PCbuild/rt.bat
@@ -38,7 +38,7 @@
if "%1"=="-d" (set suffix=_d) & shift & goto CheckOpts
if "%1"=="-x64" (set prefix=amd64) & (set tcltk=tcltk64) & shift & goto CheckOpts
-PATH %PATH%;..\..\%tcltk%\bin
+PATH %PATH%;%~dp0..\..\%tcltk%\bin
set exe=%prefix%\python%suffix%
set cmd=%exe% %dashO% -Wd -E -bb ../lib/test/regrtest.py %1 %2 %3 %4 %5 %6 %7 %8 %9
if defined qmode goto Qmode