Pull up following revision(s) (requested by skrll in ticket #950):
	sys/dev/usb/uhci.c: revision 1.255
	sys/dev/usb/uhci.c: revision 1.256
	sys/dev/usb/ehci.c: revision 1.205
	sys/dev/usb/uhci.c: revision 1.258
Add missed byteswap ops for BE machines in block added in rev 1.223.
Call usb_syncmem() against descriptors more strictly.
(not sure if the previous ones were fatal though)
Deal with control transfers better by
	- removing the UHCI_PTR_VF flag for the setup and status stages
	  which means they are scheduled less aggressively.  Some devices
	  appear to require this (blymn@ has one).  The flag was
	  introduced as a performance improvement for bulk transfers.
	- Checking for short reads and making sure the status stage runs
	  if they're encountered.
PR/47522 Enumeration of LUFA/Atmel devices on UHCI fails
Thanks to jak@ and blymn@ for testing and mlelstv@ for comments.
Ticket 950.
Pull up following revision(s) (requested by riastradh in ticket #959):
	lib/libpthread/pthread.c: revision 1.137
return errno if pthread_create hits the system limit, not just -1
(this is not entirely correct because it can return ENOMEM which is
not mentioned in the spec, but there are other places in pthread_create
whete ENOMEM is returned -- it at all, this should be fixed everywhere)
Ticket 959.