Fixes parsing of Clang versions like 20.1.7+libcxx

Upstream bug: https://github.com/pytorch/pytorch/issues/157665
--- a/torch/utils/cpp_extension.py
+++ b/torch/utils/cpp_extension.py
@@ -434,13 +434,12 @@ def get_compiler_abi_compatibility_and_version(compiler) -> tuple[bool, TorchVer
     try:
         if IS_LINUX:
             minimum_required_version = MINIMUM_GCC_VERSION
-            versionstr = subprocess.check_output([compiler, '-dumpfullversion', '-dumpversion'])
-            version = versionstr.decode(*SUBPROCESS_DECODE_ARGS).strip().split('.')
+            compiler_info = subprocess.check_output([compiler, '-dumpfullversion', '-dumpversion'])
         else:
             minimum_required_version = MINIMUM_MSVC_VERSION
             compiler_info = subprocess.check_output(compiler, stderr=subprocess.STDOUT)
-            match = re.search(r'(\d+)\.(\d+)\.(\d+)', compiler_info.decode(*SUBPROCESS_DECODE_ARGS).strip())
-            version = ['0', '0', '0'] if match is None else list(match.groups())
+        match = re.search(r'(\d+)\.(\d+)\.(\d+)', compiler_info.decode(*SUBPROCESS_DECODE_ARGS).strip())
+        version = ['0', '0', '0'] if match is None else list(match.groups())
     except Exception:
         _, error, _ = sys.exc_info()
         warnings.warn(f'Error checking compiler version for {compiler}: {error}')