[gold patch committed]: Add virtual destructor

[Ian Lance Taylor]

Some versions of g++ warn about classes with virtual functions but no
virtual destructor.  This warning triggers on Incremental_input_entry.
I committed this patch to mainline to avoid the warning.

Ian


2010-08-27  Ian Lance Taylor  <iant@google.com>

	* incremental.h (class Incremental_input_entry): Add virtual
	destructor.


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