abd66e nt32|nt64: pthread_arch.h: adjust code to match musl-1.2.2 and later

Authored and Committed by midipix 10 months ago
    nt32|nt64: pthread_arch.h: adjust code to match musl-1.2.2 and later
    [while maintaining compatibility with older musl versions]
    [cf. musl commit 3a5b9ae7cf656648c80fe155a5239d9b4fb4c485]
    
        
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file modified
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