06/06/05: version 57
	1. Changed platform specific <asm/spinlock.h> with 
		generic <linux/spin_lock.h> in wlan_thread.h.
	
06/02/05: version 45
	1. Added os_schedule().

04/25/05: version 44
	1. Added two functions wlan_carrier_on() and wlan_carrier_off()
		in os_macros.h
	2. Added a dummy macro TX_EVENT_FLAGS_SET(x, y, z) in os_macros.h

