tests: the remote_protocol check also accommodates older pdwtags
tests: the remote_protocol check also accommodates older pdwtags

This test was failing on systems using pdwtags from dwarves-1.3.
Reported by Matthias Bolte.
Two-pronged fix:
  - use --verbose to work also with dwarves-1.3; adapt regular
    expressions to handle now-varying separators
  - require a minimum number of post-split clauses, in order to
    skip upon any future format change.
    Currently there are 318; if there are 300 or fewer,
    give a warning similar to when pdwtags is missing.
* src/Makefile.am (remote_protocol-structs): Use pdwtags' --verbose
option to make 1.3 emit member sizes and offsets.
Consistently output WARNING messages to stderr.

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