windows: add script to produce Windows release artifacts

Author: indygreg

release-windows.bat

@@ -0,0 +1,6 @@
+
+py.exe build-windows.py --sh c:\dev\cygwin64\bin\sh.exe --python cpython-3.8 --profile shared-pgo
+py.exe build-windows.py --sh c:\dev\cygwin64\bin\sh.exe --python cpython-3.9 --profile shared-pgo
+
+py.exe build-windows.py --sh c:\dev\cygwin64\bin\sh.exe --python cpython-3.8 --profile static-noopt
+py.exe build-windows.py --sh c:\dev\cygwin64\bin\sh.exe --python cpython-3.9 --profile static-noopt