compile error 'CLOCK_BOOTTIME' undeclared when building in conda-forge

[notestaff]

Summary

Trying to build the current mbedtls for conda-forge, I get the following compile error:

( see https://dev.azure.com/conda-forge/84710dde-1620-425b-80d0-4cf5baca359d/_apis/build/builds/811489/logs/12 for full log)

work/library/platform_util.c:269:25: error: 'CLOCK_BOOTTIME' undeclared (first use in this function); did you mean 'CLOCK_REALTIME'?
2023-10-25T19:27:33.7496057Z 269 | ret = clock_gettime(CLOCK_BOOTTIME, &tv);
2023-10-25T19:27:33.7496705Z | ^~~~~~~~~~~~~~
2023-10-25T19:27:33.7497217Z | CLOCK_REALTIME

System information

Mbed TLS version (number or commit id):
Operating system and version:
Configuration (if not default, please attach mbedtls_config.h):
Compiler and options (if you used a pre-built binary, please indicate how you obtained it):
Additional environment information:

Expected behavior

Actual behavior

Steps to reproduce

Additional information