Fix error mythread.h

[Jamaika1]

mythread.h:381:48: error: 'once' undeclared (first use in this function); did you mean 'once_'?
  381 |                         if (!InitOnceComplete(&once, 0, NULL)) \
      |                                                ^~~~
crc64_small.c:47:9: note: in expansion of macro 'mythread_once'
   47 |         mythread_once(crc64_init);
      |         ^~~~~~~~~~~~~

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• [ ] Tests for the changes have been added (for bug fixes / features)
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[JiaT75]

@Jamaika1 Thanks for the PR! Looks like this typo had been in the code for some time, so your fix is very appreciated.

If you would like your name to appear in the THANKS file, I will need the name you wish to appear there since I could not find it on your profile. If you wish to stay anonymous that is ok too :)