tls: fix struct tls field alignment on 64-bit
tls: fix struct tls field alignment on 64-bit

Otherwise struct wastes 8 bytes for padding.

mgjv/libusual,mgjv/libusual,ifduyue/libusual,markokr/libusual,mgjv/libusual,markokr/libusual,markokr/libusual,ifduyue/libusual,rabbitt/libusual,rabbitt/libusual,markokr/libusual,mgjv/libusual,ifduyue/libusual,rabbitt/libusual,ifduyue/libusual,rabbitt/libusual