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Changed "jump __libc_init" to "call __libc_init" otherwise stack unwinding
past __libc_init may get wrong return address and crash the program or do
wield things.  With "call", return address is pushed on stack and unwinding
stops correctly at _start.  Note that __libc_init never returns, so this
fix wonʼt affect normal program execution.  But just in case it "does"
return, jump to address 0 and halt.

Change-Id: Id194fb32adcbf89ae59939cee33c50b5bbdd36fe