Use C++17 when invoking clang with the j2objcc script
Use C++17 when invoking clang with the j2objcc script

PiperOrigin-RevId: 358292496

google/j2objc,mirego/j2objc,mirego/j2objc,google/j2objc,mirego/j2objc,google/j2objc,groschovskiy/j2objc,mirego/j2objc,groschovskiy/j2objc,google/j2objc,mirego/j2objc,groschovskiy/j2objc,google/j2objc,groschovskiy/j2objc,google/j2objc,groschovskiy/j2objc,groschovskiy/j2objc,mirego/j2objc