Snappy compressor does not work on PPC

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Related to Eyescale/Equalizer#146

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No meaningful stack trace can be obtained:

Program received signal SIGABRT, Aborted.
0x015009e40000d932 in ?? ()
(gdb) bt
#0  0x015009e40000d932 in ?? ()
#1  0x015024ac20000000 in ?? ()
Cannot access memory at address 0xffd97c7001639580

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Need to extend connection handshake with compressor names on both ends. LocalNode then should not use compressors not available on one of the connected nodes.

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@tribal-tec: Can you have a look whenever you're logged onto BG/Q? The snappy code has support for ARM, so I guess it's just a matter of using a proper define.

[tribal-tec]

compressor test works with gcc and xlc on BQ/Q. Enough for verification?

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If you've reenabled snappy, then yes.