Pull up following revision(s) (requested by maxv in ticket #1333):

sys/kern/sys_lwp.c: revision 1.69 (patch)

Fix info leak: instead of using SS_INIT as a literal compound, use a global
variable from rodata. The compound gets pushed on the stack, the padding
of the structure was therefore not initialized, and was getting leaked to
userland in sys___sigaltstack14().

(martin)