Makefile: Only include one copy of the old signatures.
authorMark Wooding <mdw@distorted.org.uk>
Sun, 4 May 2014 09:44:25 +0000 (10:44 +0100)
committerMark Wooding <mdw@distorted.org.uk>
Sun, 4 May 2014 09:44:25 +0000 (10:44 +0100)
If OLDSIGMATCH matches multiple records then we'd previously include
multiple copies.


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