debugger: small refactoring of the access to the gdb process in the gdbengine
That's the first step to make the gdb/trk Adapter work with the otherwise unmodified gdb engine. GdbProcessBase is inherited by GdbProcess and the gdb/trk Adapter. In the GdbProcess case it's just a wrapper around a QProcess running gdb, in the Adapter case it's the interface to the gdb process in the whole rfomm/gdb/gdbserver combo.
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