.probes section restructuring for 11667

[Stan Cox]

These are the changes to 11667 that involve reformating the .probes section:

- The Semaphore counter is now located by a field in each probe, avoiding the
    symbol lookup

- The provider/probe name/arg strings are now located after each probe and
   get_next_probe now skips over these strings

- Remove STAP_SDT_IMPLICIT_ENABLE.  Use explicit PROVIDER_PROBE_ENABLED()
   instead
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