Verify php_uname function availability before calling EnvironmentIntegration.setOsContext()

[giilby]

Similarly to #985, I'm using sentry-php (via wp-sentry) with a WordPress site hosted on Flywheel. Unfortunately, wp-sentry doesn't currently provide a way to properly override the default integrations set up by sentry-php. Looking at the changes made in #1072, it seems like a straightforward way to remedy this issue would be to wrap EnvironmentIntegration:31 with a check to see if the php_uname function is available. Is there any reason not to do this? I'm happy to submit a PR with the change if it makes sense. Thanks!

[ste93cry]

As I mentioned in the past, I think this is the classic case of "security through obscurity" and by wrapping the function calls with a function_exist check may open the door to end up like WordPress that checks that all functions exist. Anyway, I would happily accept a PR if you want to propose the change 😄

[ste93cry]

The fix has been released in version 3.3.3