Allow for enabling of USE_IMP_SYS in Win32 unthreaded builds. #45
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Enabled by merging of Perl/perl5#23178 .
As of the merging of that PR, it is possible that an unthreaded Win32 build of perl has both USE_MULTI and USE_IMP_SYS defined.
The opening line of code in t/GetCurrentThreadId.t makes the (now) incorrect assumption that the perl is unthreaded because USE_IMP_SYS is defined.
This PR corrects that opening line by instead checking $Config{useithreads} for definedness.