RFR(S): 8138733: Fix build: gcc < 4.8 doesn't grok -Wno-format-zero-length added in 8080775

[Lindenmaier, Goetz]

Hi,

We appreciate change 8080775 a lot, but it breaks the build with older gcc.
They don't know the option -Wno-format-zero-length.

To fix this, I only add -Wno-format-zero-length for gcc >= 4.8.
For the other gccs, I remove ATTRIBUTE_PRINTF from the declaration of
report_vm_error().
This is no big deal, as correctness is guaranteed once it's compiled with
gcc 4.8.

I had to fix one fatal() in the ppc files, too.

Please review this change.  I please need a sponsor.
http://cr.openjdk.java.net/~goetz/webrevs/8138733-warn/webrev.00/

Best regards,
  Goetz.


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