Reinstate existing torch script (#24729)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

use_existing_torch.py

 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
-print("vLLM is now using 'uv' to disable build isolation for 'torch'.")
-print("Please instead install vLLM with 'uv pip install -e .' (must use 'uv')")
+import glob
+
+requires_files = glob.glob('requirements/*.txt')
+requires_files += ["pyproject.toml"]
+for file in requires_files:
+    print(f">>> cleaning {file}")
+    with open(file) as f:
+        lines = f.readlines()
+    if "torch" in "".join(lines).lower():
+        print("removed:")
+        with open(file, 'w') as f:
+            for line in lines:
+                if 'torch' not in line.lower():
+                    f.write(line)
+                else:
+                    print(line.strip())
+    print(f"<<< done cleaning {file}")
+    print()
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