[RFA/RFC] testsuite: gdb_run_cmd tweak

[Michael Snyder]

This just adds a regular expression to prevent gdb_run_cmd
from choking on the msg that gdb emits when it detects that
the file has changed and re-reads the symbols.

I honestly don't remember the circumstances that caused me
to add this -- it's been sitting in my sandbox for a while.
Thought it would be better to offer it up than to throw it
away...

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