Avoid clang warning

Arndt, Danielrequested to merge
github/fork/masterleinad/fix_clang_warning into master

Created by: masterleinad

clang complains:

examples/bvh_driver/bvh_driver.cpp:268:21: warning: braces around scalar initializer [-Wbraced-scalar-init]
      , _owner_ptrs{{new char[std::strlen(exe) + 1]}}
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.

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