Applied new fastsafetensors fix to mxfp4 build; disabled wheel builds by default

fastsafetensors_mxfp4.patch

@@ -0,0 +1,33 @@
+--- a/vllm/model_executor/model_loader/weight_utils.py
++++ b/vllm/model_executor/model_loader/weight_utils.py
+@@ -8,6 +8,7 @@
+ import hashlib
+ import json
+ import os
++import re
+ import tempfile
+ import time
+ from collections import defaultdict
+@@ -786,6 +786,14 @@
+     loader.add_filenames(rank_file_map)
+     return loader
+
++def _natural_sort_key(filepath: str) -> list:
++    """Natural sort key for filenames with numeric components, such as
++    model-00001-of-00005.safetensors -> ['model-', 1, '-of-', 5, '.safetensors']"""
++    return [
++        int(s) if s.isdigit() else s
++        for s in re.split(r"(\d+)", os.path.basename(filepath))
++    ]
++
+
+ def fastsafetensors_weights_iterator(
+     hf_weights_files: list[str],
+@@ -801,6 +809,7 @@
+         pg = SingleGroup()
+         device = torch.device(f"cuda:{pg.rank()}")
+
++    hf_weights_files = sorted(hf_weights_files, key=_natural_sort_key)
+     weight_files_sub_lists = [
+         hf_weights_files[i : i + pg.size()]
+         for i in range(0, len(hf_weights_files), pg.size())