lib: Properly mark threads above 32 as available
This fixes the following MSVC warning: ../src/lib.c(460): warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
This fixes the following MSVC warning: ../src/lib.c(460): warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
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