Use 'frame' instead of 'signal', take out stdlib.h in silk/.
On MacOS, stdlib.h ends up including sys/signal.h, generating warnings about the local variables called 'signal' shadowing the global symbol signal(3). This was originally done in 86476906 but it missed some use of 'signal' in prototypes in headers where it didn't cause warnings. Later the prototypes were moved around and the warnings came back. This also cleans up some cases in where stdlib.h was used but shouldn't be required.
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