Fix ____longjmp_chk for ppc(64)

[Andreas Schwab]

Steve Munroe <sjmunroe@us.ibm.com> writes:

> The generated binary will not be identical (includes non-volatile FPRs and
> VRs in the jumpbuf) There is a reason for this separation including the
> versioning of the interface for the VMX add.

Since the __longjmp_chk function is new, there is no need for it to
support the old jumpbuf.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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