[gccgo] Always define TARGET_THREAD_SPLIT_STACK_OFFSET on GNU/Linux

[Ian Lance Taylor]

The stack split code was only defining
TARGET_THREAD_SPLIT_STACK_OFFSET if TARGET_LIBC_PROVIDES_SSP was
defined.  That was due to my earlier use of the stack protector field
for stack splitting.  However, that is no longer the case, so this
patch fixes the problem.  Committed to gccgo branch.

Ian


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