[checkpatch.pl] runtime error by version dependency.

[Tetsuo Handa]

Hello.

Commit d1fe9c09 "checkpatch: add some --strict coding style checks"
introduced dependency on perl >= 5.10.0 .

While the comment says that "Any use must be runtime checked with $^V",
it is not runtime checked when running with perl == v5.8.4 , failing with

  Nested quantifiers in regex; marked by <-- HERE in m/(\((?:[^\(\)]++ <-- HERE |(?-1))*\))/ at ./scripts/checkpatch.pl line 340.

error.
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