Fix issue when osdThreadGetTimer() called from non EPICS threads #200
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This fixes the issue reported in https://epics.anl.gov/tech-talk/2021/msg01691.php
The function need to use epicsThreadImplicitCreate() to handle the case of if it is called from a non EPICS thread - this approach is already used in epicsThreadSuspendSelf, epicsThreadGetPrioritySelf, epicsThreadGetIdSelf and epicsThreadGetNameSelf.
This repeated logic should probably be moved into a separate function, but maybe that is for a separate PR?