Clear windows branch; preserve previous contents in win-old

tools/windows/gpu_targets.py

@@ -1,10 +0,0 @@
-"""Canonical Windows build target registry, shared with CMake and PowerShell."""
-import json
-import pathlib
-
-data = json.loads(pathlib.Path(__file__).with_name('gpu-targets.json').read_text())
-if data['schema'] != 1:
-    raise RuntimeError('Unsupported GPU target registry schema')
-TARGETS = {row['architecture']: row for row in data['targets']}
-if len(TARGETS) != len(data['targets']):
-    raise RuntimeError('Duplicate GPU target')