Allow setting ucnc_t platform via UCNC_PLATFORM env variable
Allow setting ucnc_t platform via UCNC_PLATFORM env variable

habanero-rice/cnc-framework,habanero-rice/cnc-framework,habanero-rice/cnc-framework,habanero-rice/cnc-framework,habanero-rice/cnc-framework,habanero-rice/cnc-framework