Fix alignment of sys_lwmutex_t
Fix alignment of sys_lwmutex_t

Some of the sys_lwmutex functions require the sys_lwmutex_t to be
aligned to 64 bits.  Assure that this alignment is provided by
making the first element 64 bits wide.

hank/PSL1GHT,andoma/PSL1GHT,ps3dev/PSL1GHT,ps3dev/PSL1GHT,HACKERCHANNEL/PSL1GHT,HACKERCHANNEL/PSL1GHT,hank/PSL1GHT,andoma/PSL1GHT,ps3dev/PSL1GHT,ps3dev/PSL1GHT,HACKERCHANNEL/PSL1GHT