Function krun_has_feature 

pub unsafe extern "C" fn krun_has_feature(feature: u64) -> i32

Checks if a specific feature was enabled at build time.

Arguments: “feature” - one of the KRUN_FEATURE_* constants.

Returns: 1 if the feature is supported, 0 if not supported, or a negative error number on failure (e.g., -EINVAL for invalid/unknown feature constant).

Notes: When linking against an older version of libkrun, this function may return -EINVAL for feature constants that were added in newer versions.