[clang-format] Wildcard expansion on Windows.

Summary:
Add support for wildcard expansion in command line arguments on Windows.
See https://docs.microsoft.com/en-us/cpp/c-language/expanding-wildcard-arguments

Fixes https://bugs.llvm.org/show_bug.cgi?id=17217

Reviewers: klimek, djasper, rnk

Reviewed By: rnk

Subscribers: rnk, smeenai, zturner, alexfh, mgorny, cfe-commits

Differential Revision: https://reviews.llvm.org/D44778

git-svn-id: svn://svn.chromium.org/llvm-project/cfe/trunk/tools/clang-format@328495 0b72dbe1-c17f-4bc7-b9db-2b4152be0356
1 file changed