error: 'value' is unavailable: introduced in macOS 10.13

[jakemumu]

Hey @sudara

I've got perfetto integrated into a CMake project which supports back to 10.9

Seems in the newest update value was added which blocks support prior to 10.13, was this an intentional change?

Any suggestions on supporting 10.9 on production deploys but 10.13 while using this package?

Thanks!

Jake