mbedtls 3.6 uses clock_gettime(CLOCK_MONOTONIC) in platform_util.c
which requires iOS 10.0+. When VLC contribs build with
-Werror=partial-availability and a deployment target of iOS 9.0,
this becomes a hard error.
The runtime fallback already handles the case correctly:
clock_gettime returns -1 on older iOS and mbedtls_ms_time() falls
back to time(NULL) * 1000.
Suppress -Wunguarded-availability for the bundled mbedcrypto static
library only, consistent with the six other warning suppressions
already applied to the bundled build.
Sergio Ammirata
f09bac21b7