Check compile time library version
check_compiletime_version:"4.0.0"

Check runtime library version
check_runtime_version:"4.0.0"

Check for MBEDTLS_VERSION_C
check_feature:"MBEDTLS_VERSION_C":0

Check for MBEDTLS_TIMING_C when already present
depends_on:MBEDTLS_TIMING_C
check_feature:"MBEDTLS_TIMING_C":0

Check for unknown define
check_feature:"MBEDTLS_UNKNOWN":-1